Question

Each of the sentences provided may contain a grammar or usage error. Read each sentence, and then identify the section that contains the error, if there is one, by selecting the appropriate answer choice. If there is no error in the sentence, choose no error. Their cousins is coming to visit this summer from Germany.

Answer 1

Their cousins are coming to visit this summer in Germany.

or

Their cousin is coming to visit this summer in Germany.

Depending on how many cousins they are referring to it which sentence would correct the error.

The problem is only because the subject and verb don't agree.