Rajesh is . . . . . . . . tallest boy in the class. A. a B. an C. the D. no article

The correct answer is: D. no article

The word “tallest” is a superlative adjective, which means that it is used to compare one thing to all other things in a group. In this case, Rajesh is being compared to all the other boys in the class. When we use a superlative adjective, we do not use an article.

The other options are incorrect because they are all articles. Articles are used to introduce nouns. In this case, we do not need an article because we are not introducing a new noun. We are simply describing Rajesh.

Here are some more examples of how to use superlative adjectives without articles:

• She is the smartest student in the class.
• He is the fastest runner in the world.
• This is the most beautiful painting I have ever seen.