Gas and dust given off from the star form together to form protoplanets, large protoplanets collide to form planetesimals, and some planetesimals are drawn together to form planets is the most likely sequence of events for the formation of planets around a star.
A planet is referred to a large object which orbits around a star and example include mercury, earth etc.
They were formed from dust and gas which is the reason why option A was chosen as the most appropriate choice.
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