What would happen if the earth's orbit suddenly became smaller?

A) The earth's water would evaporate.

B) The earth's water would freeze.

C) The earth's atmosphere would float away.

D) The earth's atmosphere would collapse.

It's A) The Earth's water would evaporate. This is because due to the smaller orbit, Earth would get closer to the sun; that would, in turn, raise the tempurature on the surface. This would cause the water on earth to evaporate much faster than it naturally does in the water cycle.