Explain how rock d is the best rock

The best rock is D because it is big and heavy out of all of them. Rock A would fling too far because it is the lightest of all rocks as shown.

 B and C would probably fling through the target because it is just the right size. 

Besides, Depending on their weight of each rock, rock D is heavy because it is big. Rock A is too light to fling or land on the target. This is my hypothesis.

I don't really get how would rock D be the best one, but upon your question, this is all i know. 

Thank you for posting your question, hope this helps, have a great day. please mark brainliest so i can answer more of your questions. 

Answer form flower;

The answer is: c. from underground