Step 1: Understanding the Question:
This is a sentence correction/error detection problem. We need to check for grammatical errors in Subject-Verb agreement and the usage of relative pronouns.
Step 2: Detailed Explanation:
The Core Subject: The main subject of the sentence is "The number of students".
Subject-Verb Agreement (Main Clause): Expressions like "The number of" are followed by plural nouns but take a singular verb. Here, "is increasing" correctly agrees with "The number". So, Part (D) is correct.
The Relative Clause: Part (B) contains the relative clause "who has applied". The relative pronoun "who" refers back to its antecedent, which is "students".
Error Identification: Since "students" is plural, the verb in the relative clause must also be plural to maintain agreement.
- Incorrect: "students who has applied"
- Correct: "students who have applied"
Nuance: Students (plural) are the ones applying. Therefore, the action of applying should be attributed to them in plural form.
Final Review: Part (A) is "The number of students" (Correct). Part (B) is "who has applied" (Incorrect - should be 'have'). Part (C) is "for the scholarship" (Correct). Part (D) is "is increasing" (Correct).
Step 3: Final Answer:
The error lies in part (B). The singular verb "has" should be replaced with the plural verb "have" to agree with the antecedent "students".