A rock can get polished from water running over it? A. in between other rocks
B. in a river
C. On top of a mountain
D. Under a sidewalk

The answer is B.  A river is a body of water, therefore, there will always be some water running over the rock.

The answer is: B

Explanation:

The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).

I hope this helped! :))

11 players on a field that has a maximum of 11 players

the answer is b & c i believe : )