Idon't want to discourage you, but the test is rather difficult
the prefix of the italicized word (discourage) in the above sentence is:
a.) our
b.) dis
c.) age
d.) scour

B.) Dis.

Explanation:

A prefix is illustrated as the morpheme that is placed before the root words to modify the meaning of the word. In the given example, the root word is 'courage' which exemplifies a noun meaning 'the ability of being confident and not being afraid' but the prefix 'dis' meaning 'apart' or 'away' alters the meaning when added to 'courage' and becoming 'discourage' that implies a verb meaning 'deprive(away) from courage'. Thus, prefixes help formulate new words derived from the basic root words. Therefore, option B is the correct answer.