error in subject-verb agreement.

A.One of Sam's children are attending Harvard University.
B.The baseball team are headed for Atlanta tomorrow.
C.the senator, along with her aides, are planning to arrive by noon.
D. Each of the bus drivers has been trained in first aid.
I think the answer is B

A, B, and C have errors in subject-verb agreement.

Hello Im am stuck on these sentence things and we have to say if it is a preposition, verb, pronoun, conjunction ect. what do I do?

Subject-verb agreement refers to the correct matching of the verb form with the subject in a sentence. This agreement ensures that the verb agrees with the number and person of the subject. Let's analyze each sentence to identify the error:

A. One of Sam's children are attending Harvard University.
The error here lies in the verb form "are" which is plural, while the subject "One," referring to a child, is singular. The correct verb form should be "is." So, the error is with subject-verb agreement.

B. The baseball team are headed for Atlanta tomorrow.
In this sentence, the subject "The baseball team" is a collective noun, referring to a group of individuals considered as one unit. Consequently, the correct verb form should be singular, "is" instead of "are." So, the error is with subject-verb agreement.

C. The senator, along with her aides, are planning to arrive by noon.
Similar to the previous example, the subject "The senator, along with her aides" is a collective noun, and hence should be followed by a singular verb, "is," instead of "are." The error is with subject-verb agreement.

D. Each of the bus drivers has been trained in first aid.
In this sentence, the subject "Each" is singular, which is why it agrees with the singular verb form "has." There is no error in subject-verb agreement in this sentence.

Based on the analysis above, the sentences with errors in subject-verb agreement are A, B, and C.