A. Mass = 2.0 and Speed = 6.0

B. Mass = 4.0 and Speed = 5.0

C. Mass = 6.0 and Speed = 4.0

D. Mass = 8.0 and Speed = 2.0

The statement does not provide enough information to determine the correct answer. We need to know what concept or problem we are trying to solve in order to find the relevant answer.