We need to find the option that would best be represented by positive 32 (+32).
So we need to find which of the options represents a positive change in the amount.
In option A we have a decrease of speed by 32 miles per hour. Since this is a decrease, it cannot be represented by positive 32, instead, this option will be represented by negative 32.
In options C and D we have something similar to A, a decrease in amount, so those cannot be the right option.
In option B, however, we have an addition of 32 books to a library. Since this is an increase in the number of books, this is the option that would best be repeated by positive 32.
Answer: Option B. Adding 32 books to a library.