Explanation:

Correct answer is (e). Statement I As many students are now very concerned about the environment, it is a good sign for the country as well as the society. This is correct since both the statements are connected meaningfully. Statement II That many students are now very concerned about the environment is a good sign for the country as well as the society. This is also correct since both the statements are connected meaningfully. Statement III is not correct since the connector is used is not correct. ‘Though’ is used to denote that despite of something it is taking place. In this context, it will not be applicable. Hence, only I and II are correct as the combined statements in these two cases make meaningful and contextually correct sentences. So, option E is the right choice.