To answer this question, we need to know the movie in which Fatima Sana Shaikh acted as a child artist. Let's go through each option to determine the correct answer:
Option A) Bajrangi Bhaijaan - Fatima Sana Shaikh did not act as a child artist in this movie.
Option B) Mr. India - Fatima Sana Shaikh did not act as a child artist in this movie.
Option C) Kuch Kuch Hota Hai - Fatima Sana Shaikh did not act as a child artist in this movie.
Option D) Chachi 420 - Fatima Sana Shaikh acted as a child artist in this movie.
The correct answer is D) Chachi 420. Fatima Sana Shaikh played the role of Kamal Hassan's daughter in the movie Chachi 420.