Step 1: Determine the 51st Chief Justice.
Justice Uday Umesh Lalit was appointed as the 51st Chief Justice of India.
Step 2: Evaluate each option.
- (A) Justice Ranjan Gogoi: Served as the 46th Chief Justice of India.
- (B) Justice Uday Umesh Lalit: The 51st Chief Justice of India, thus the correct choice.
- (C) Justice D.Y. Chandrachud: The current Chief Justice of India, but not the 51st.
- (D) Justice Sanjiv Khanna: A judge, but has not held the position of Chief Justice.
Step 3: Final Answer.
The correct option is (B) Justice Uday Umesh Lalit, who was appointed the 51st Chief Justice of India.