Read the following two sentences. The first sentence is a controlling idea, and the second sentence is an example. What is the problem of the example?I had a terrible working day today.Yesterday, I spent a whole evening checking my little girl’s homework.

Read the following two sentences. The first sentence is a controlling idea, and the second sentence is an example. What is the problem of the example?I had a terrible working day today.Yesterday, I spent a whole evening checking my little girl’s homework.
A.Lacking relevance.
B.Lacking details.
C.Not sufficient.
D.Not vivid.
正确答案：Lacking relevance.