THESE ARE WRITTEN IN THE CORRECT WAY
As many times as you want makes most sense to me but they all fit in the sentence
I believe the answer is, actually, D. The red will be too exciting and distracting to the calm library.
If you research the library, it is actually quite a colourful place, but the red on the inside, as well as the outside, would have been too much and indeed; distracting and exciting.
