. . . . . . . . you read, the more you will learn. A. The less B. The lesser C. The most D. The more

The correct answer is D. The more you read, the more you will learn.

The other options are incorrect because they do not make sense in the context of the sentence.

• The less you read, the less you will learn. This is not necessarily true. It is possible to learn a lot from reading a small amount of material, if it is well-chosen and well-read.
• The lesser you read, the lesser you will learn. This is simply a grammatically incorrect way of saying “The less you read, the less you will learn.”
• The most you read, the most you will learn. This is also grammatically incorrect, and it does not make sense in the context of the sentence. It is possible to read a lot and not learn anything, if the material is not well-chosen or well-read.

In conclusion, the correct answer is D. The more you read, the more you will learn.