UPSC CSE Prelims

Correct Option: B Explanation: The evolved Laser Interferometer Space Antenna (eLISA) was conceived as a space-based laser interferometry mission to detect low-frequency gravitational waves. Option-wise Analysis: A: Incorrect - Neutrino experiments use particle detectors rather than this space laser interferometer. B: Correct - Correct-eLISA/LISA targets gravitational waves from massive astrophysical systems. C: Incorrect - Missile-defence performance testing is unrelated to eLISA. D: Incorrect - Solar-flare communication effects are studied by space-weather missions, not the main eLISA objective.