Question: Why are the rocks and pebbles found on riverbeds usually smooth?

  Options: 
 A. The rocks and pebbles in riverbeds are not very old.
 B. The rocks and pebbles rub against each other as water flows over them.
 C. Rivers can only flow over smooth rocks and pebbles.
 D. Organisms in the rivers break down the rocks and pebbles. 
Answer: B