Question #N870

It is often said that one should never judge a book by its cover, but the cover design of a book can often tell you quite a bit about the book's content. For example, a book with a bright, colorful cover may indicate a more lighthearted or whimsical story, whereas a book with a dark, somber cover may indicate a more serious or suspenseful story. Of course, this is not always the case, as some books with seemingly lighthearted covers can actually be quite serious, and some books with seemingly dark covers can actually be quite whimsical. The cover design of a book can be a valuable tool for helping to guide a reader’s expectations, but it is important to remember that the cover is just one part of the book.

Which of the following is the most effective way to revise the underlined portion to maintain the consistency of verb tense in the sentence?
A. but it is important to remember that the cover is just one part of the book.
B. but it is important to remember that the cover is just one part of the books.
C. but it is important to remember that the cover was just one part of the book.
D. but it is important to remember that the cover has been just one part of the book.