Explanation:

Correct Answer is (d).

Common Explanation:
Since the first sentence is given of the paragraph, it is very easy to understand the topic of the passage which is regarding the achievement of India in eradicating polio from the country. This is the premise on which the sentences are based and they have to be rearranged accordingly.
After the given sentence, the next sentence should be based on the reason behind the success of the polio eradication scheme of the government in the country when most of the other schemes do not generally become successful in the country. Among the given options, Statement E explains the reason of such a feat as the contribution of the government as well as the ground level workers of the organization.

Connectors:
First sentence and E:
1. The World Health Organization has declared India as polio-free since no new polio case has been reported in the country in the last couple of years.
E. This underlines the efforts by the Ministry of Health and Family Welfare along with the staff members at the ground level.
E should be followed by a statement in which there is some inference for the government from the success of the polio eradication program of the government. C should come after that since it explains in detail that the government should think of replicating the same model in case of other diseases also.

Connectors:
E and C:
E: This underlines the efforts by the Ministry of Health and Family Welfare along with the staff members at the ground level.
C: India can take heart from this success and can replicate the same model for eradication of other diseases also from the country.
Now, C has explained the lesson that should be learnt from this step of the government. This must be followed by something that denotes the main issue behind such problems and the mantra for success behind such programs of the government. D explains that and comes after C.
Connectors:
C: India can take heart from this success and can replicate the same model for eradication of other diseases also from the country.
D: The thrust should be on educating the mass regarding the harmful effects of insects and the reasons for the growth of such insects.
D should be followed by a statement that denotes the importance of the step explained in this sentence i.e. the participation of general public in the eradication drive of any program. B explains the importance of participation of people and should follow D.
Connectors:
D: The thrust should be on educating the mass regarding the harmful effects of insects and the reasons for the growth of such insects.
B: Without participation from the general public, it would not have been possible to achieve this tremendous feat with the government schemes only.
A will come at the end of the passage as it underlines the lesson that should be internalized by the government from the model in which polio eradication drive has been launched in the country.
This makes the correct sequence of statements as: ECDBA