ENTIRE

The correct answer is C. Whole.

A whole is the complete amount or extent of something. It is the opposite of a part. A part is a piece or section of something that is not the whole. A quarter is one of four equal parts of something. A half is one of two equal parts of something.

For example, if you have a pie, the whole pie is the entire pie. If you cut the pie into four equal pieces, each piece is a quarter of the pie. If you cut the pie into two equal pieces, each piece is a half of the pie.

In the question, the word “entire” means “the whole amount or extent of something.” Therefore, the correct answer is C. Whole.