Which of the following statement is correct about using a long and detailed example in our writing?

A.Providing a long and detailed example is much easier than using several short examples.

B.It is not necessary to cover all the key words in a long and detailed example.

C.A long and detailed example is not compatible with several short examples.

D.A concluding sentence is often necessary to end a long and detailed example.

正确答案：A concluding sentence is often necessary to end a long and detailed example.