Explanation:

Correct Answer is (c).According to the given context, it is something regarding the anti-trust regulation in India and the ways to implement the same in practice.
Coming to the options, A is not correct since medicines will not be correct for the first blank whereas in B, both the words are completely out of context. In case of D, corrections cannot be placed in the first blank since it will not imply anything. Only option C is correct since both the words are perfect fit for the blanks.
The sentence would be:
As a first step in looking at the antitrust issues, it is important to look at the economic principles that govern platforms.
This makes option C the correct choice among the given options.