The correct answer is: D. read, sufficient.
The word “cover” means to protect or conceal something. It does not make sense to say that someone wanted to protect or conceal all these books.
The word “peruse” means to read something carefully and in detail. It does not make sense to say that someone wanted to read all these books carefully and in detail, but could not find the necessary time to do so.
The word “dispose” means to get rid of something. It does not make sense to say that someone wanted to get rid of all these books.
The word “buy” means to purchase something. It does not make sense to say that someone wanted to purchase all these books, but could not find the time to do so.
The word “read” means to look at and understand the meaning of written or printed words. It makes sense to say that someone wanted to read all these books, but could not find the sufficient time to do so.