Which statement is a hypothesis these students might be using in their experiments?

A. This experiment test how the speed of a toy car changes with the steepness of the ramp
B. It’s fun to see how fast the cars roll down the steepest ramp
C. Will a toy car roll faster down a steeper ramp
D. If a toy car is rolled down ramps of different stiffness it will roll faster on the steepest ramp

D. If a toy car is rolled down rams of different steepness it will roll faster on the steepest ramp

Yes, that is correct. The statement D is a hypothesis that the students might be using in their experiments.

The hypothesis that these students might be using in their experiments is C. "Will a toy car roll faster down a steeper ramp."

C. Will a toy car roll faster down a steeper ramp