The collision of a comet and a planet is an exceptional event in that it occurs only rarely.
What is collision?
Collision is an encounter between particles.
What is comet?
Comets are the leftovers from solar system.
What is Planet?
A planet is a celestial body which has its own motion.
What is exceptional?
Exceptional means unusual.
What is event?
Event means an occasion.
What is rarely?
Rarely means not often.
Comet hits the planet only in a rare case. In few million hundreds years ago, Earth was hit by a comet wherein we get all the minerals and water now.
Hence the option (D) is correct.
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