Explanation:

According to the given context of the statement, it is clear that we are talking about the details of a certain scheme in which it is promised that secondary and tertiary healthcare services will be provided to the beneficiaries of the scheme.
Among the given options, A seems correct but it will not be able to imply the correct meaning of the statement whereas option C is the correct choice as the word to fill in the blank as it implies the intended meaning of the statement. Other two words are out of context in case of this statement.
The complete sentence would be:
The scheme seeks to provide coverage for hospitalisation at the secondary and tertiary levels of healthcare.
This makes option C the correct choice among the given options.