Select the letter that identifies the type of noun that is in

parentheses in the following sentence:
One (change) in athletics over the past twenty years has been the growth
in women's athletic opportunities.
a. proper
b. concrete
c. collective
d. abstract
e. possessive form

d. abstract

The noun "change" in the sentence is an example of a (d) abstract noun.

Abstract nouns refer to ideas, qualities, emotions, or concepts that cannot be perceived using the five senses. In this sentence, "change" is not something that can be physically seen or touched, but rather a concept or idea related to the growth in women's athletic opportunities over the past twenty years.