Step 1: Analyze the definite article usage.
When referring to something unique or specific, such as "the most beautiful girl," we use "the" to indicate a particular thing that stands out.
Step 2: Analyze each option.
- (A) a: Incorrect. "A" is an indefinite article, and here we need "the" for specificity.
- (B) the: Correct. "The" is the definite article and is used with superlative adjectives like "most beautiful."
- (C) an: Incorrect. "An" is used before vowel sounds, but "the" is needed here.
- (D) any: Incorrect. "Any" is used to refer to something unspecific or in questions, which doesn’t fit in this context.
Step 3: Conclusion.
The correct sentence is "She is the most beautiful girl."