Science

Step 1: Understanding the Indian Space Missions.
Aditya-L1 is the mission launched by ISRO to study the Sun, and it completed its halo orbit around the Sun-Earth L1 point.

Step 2: Analyzing the options.
- (A) Gaganyaan L1: Gaganyaan is India's crewed mission, not related to the Sun-Earth L1 point.
- (B) Aditya-L1: This is the correct answer, as it is the mission designed to study the Sun and completed its halo orbit around the Sun-Earth L1 point.
- (C) Mangalyaan-L1: Mangalyaan is India's Mars mission and does not involve the Sun-Earth L1 point.
- (D) Chandrayaan-L1: Chandrayaan is ISRO's Moon mission, unrelated to the Sun-Earth L1 point.

Step 3: Conclusion.
The correct answer is (B) Aditya-L1, as it completed its orbit around the Sun-Earth L1 point.