Which sentence has a subject-verb agreement error?
a) why doesn't the weatherman ever accurately predict the possibility of rain on field trip days?
b) the hockey players who were caught out past curfew were benched for the first half of the game.
c) the songs we are going to memorize for the christmas musical are going to be difficult to remember.
d) the box of ornaments in the attic that my grandmother gave me are as priceless as they are beautiful.

D) The box of ornaments in the attic that my grandmother gave me are as priceless as they are beautiful.

Explanation: A subject-verb agreement error occurs when we use a singular subject with a plural verb, or a plural subject with a singular verb. The first sentence is correct because the subject is "The weatherman" (singular) and the verb is "doesn't predict" (singular)  In the second sentence the subject is "the hockey players" (plural) and the verbs are "were" caught and "were benched" (plural). In the third sentence the subject is "The songs" (plural) and the verb is "are going to be" (plural). And finally the error is in the last sentence where the subject is "The box of ornaments" (singular) and the verb is "are" (plural), it should be: "The box of ornaments in the attic that my grandmother gave me is as priceless as it is beautiful."

the answer is actually c   i just got done with the test.

i suggest it is anadiplosis