Which of the following describes a comet? a. large objects (> 10 m) in space originating from a region between jupiter and mars b. icy objects that form a tail as they come close to the sun c. small objects that burn up in earth's atmosphere d. objects that survive passing through earth's atmosphere and hit the ground

b. Icy objects that form a tail as they come close to the Sun

Explanation:

Acording to NASA comets are cosmic snowballs made out of frozen gases, rock and dust, they usually are the size of a small town and contain water and organic compounds due to the collisions with Earth and other planets. When its orbit brings it close to the sun, it heats up, spewding dust and gases forming a tail that streches away from the sun, they also have a  glowing head that is larger than most planets.

Considering this information we can conclude that the correct answer is  b. Icy objects that form a tail as they come close to the Sun.

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b) phosphorus pentoxide