Derrick was given a test where he had to identify morphemes. In one particular case, he was asked to identify the number of morphemes in the word rescuer. If Derrick answered correctly, he was able to identify morpheme(s).

2

Explanation:

Derrick was given a test where he had to identify morphemes. In one particular case, he was asked to identify the number of morphemes in the word rescuer. If Derrick answered correctly, he was able to identify 2 morpheme(s).  Morphemes is the smallest meaningful unit of a language that cannot be further divided. The word rescuer can be divided into two morphemes which as "res" and "cuer".

if im not mistaken its a. collective emotional arousal