Read the information below. Then use it to answer the following question.

A car’s tires feel a lot of force when they pass over holes or bumps in a road. Shock absorbers help dull the force coming from the road so that a vehicle shakes less in response. This makes the ride for passengers within the car smoother and more pleasant.

The analogy below compares the relationship between pH and specialized chemicals. Choose the answer that best completes this analogy.

_[blank]_ : solution pH :: shock absorbers : vehicle movement