Speed, speed, proportion, concentration, inverse ratio.

Problem solving process:

Reaction rate = k * (a 2) * (1/b)

After b rises 100%, b' = (1+ 100%) b = 2b.

In order to keep the reaction rate unchanged, k * (a 2) * (1/b) = k * (a' 2) * (1/b').

If k is omitted, it is replaced by b', (a 2) * (1/b) = (a' 2) * (1/2b).

B rounded, a' 2 = 2 * (a 2)

Root numbers on both sides, A'= root number 2 * a.

The root number 2 = 1.4 14, so it increased by 40%.

So choose (c)

I hope it is helpful to you and I hope to adopt it ~ ~ ~