Activation Energy Is Similar to the "Push" Needed to Start

Activation energy is similar to the "push" needed to start rolling a stalled car down a hill. How do enzymes fit into this analogy?

A) Enzymes increase the effort that's needed to start the car moving.
B) Enzymes decrease the effort that's needed to start the car moving.
C) Enzymes add a roadblock on the hill that the car will roll down.
D) Enzymes decrease the size and shape of the car that needs to be moved.