Choose the word that is a necessary part of the underlined word.
glacier

A. mountain

B. winter

C. prehistory

D. ice

Answer: Option D

Solution(By Examveda Team)

A glacier is a large mass of ice and cannot exist without it. A glacier can move down a mountain, but it can also move across a valley or a plain, which rules out choice a. Glaciers exist in all seasons, which rules out choice b. There are many glaciers in the world today, which rules out choice c.