Correct option is D
Given information:
· Koyal is third to the left of Rahul.
· Tanu is third to the right of Cheenu.
· Mohit is second to the right of Sunil.
· Abhishek is second to the left of Cheenu.
· Tanu is second to the left of Sunil.
From the above given instruction the arrangement will be:

Rahul is sitting second to the right of Ankit.
Thus, correct option is (d).