She is the most tallest girl in our entire class.

In the following sentence, a part of the sentence has been bold. Below are given alternatives to the bold part which may improve the sentence.

Choose the correct alternative. Wherever no improvement is needed, choose ‘No replacement required’ as the answer.

The correct answer is the tallest girl.

Explanation:

In the original sentence, "She is the most tallest girl in our entire class," the phrase "most tallest" contains a double superlative error.

In English grammar:

1. The adjective "tall" is a one-syllable word. Its comparative form is "taller" and its superlative form is "tallest".

2. We form the superlative of short (one-syllable) adjectives by adding the suffix "-est" (e.g., tallest), not by adding the word "most". Adding "most" before an already superlative form like "tallest" is redundant and incorrect.

3. Furthermore, when referring to a superlative degree specifying a unique item or person in a group ("in our entire class"), the definite article "the" must precede the superlative adjective (i.e., "the tallest girl").

Therefore, replacing "the most tallest girl" with "the tallest girl" corrects the sentence to make it grammatically sound: "She is the tallest girl in our entire class."