Which of the following is the correct grammatical correction of the sentence: Shreya, who she is my best friend, is a singer?

Introduction / Context:
This question tests basic English grammar, specifically how to use a relative clause with the pronoun who to give extra information about a person. The original sentence Shreya, who she is my best friend, is a singer contains an incorrect and redundant pronoun. The task is to choose the corrected version that follows standard English grammar while keeping the meaning the same.

Given Data / Assumptions:

• The original sentence is Shreya, who she is my best friend, is a singer.
• We want to describe Shreya and add extra information that she is my best friend.
• The clause is extra information, so it should be a non defining relative clause between commas.
• We assume standard modern English grammar usage for relative pronouns.

Concept / Approach:
In a non defining relative clause that refers to a person, the normal structure is noun, who plus verb plus rest of clause, comma and then the main clause continues. We do not repeat the subject with an extra pronoun such as she. So the correct pattern is Shreya, who is my best friend, is a singer. The word who already functions as the subject of the relative clause, so adding she creates an ungrammatical double subject. Any option that keeps who she together is therefore wrong.

Step-by-Step Solution:
Step 1: Identify that who introduces a clause that gives more information about Shreya.Step 2: Remember that in such a clause who takes the place of the subject pronoun, so we say who is, not who she is.Step 3: Check option B, which reads Shreya, who is my best friend, is a singer. This has a clear subject who and the verb is, followed by the complement my best friend.Step 4: Check option A, which reads Shreya, she who is my best friend, is a singer. This has an extra pronoun she placed before who, which is not standard.Step 5: Check option C, which splits the sentence in an unnatural way and still contains the wrong phrase who she. Therefore, only option B is fully correct.

Verification / Alternative check:
We can compare with other correct examples such as Rohan, who is my cousin, lives in Delhi or Maria, who is a doctor, works at the city hospital. None of these sentences add an extra pronoun after who. If we tried to say Rohan, who he is my cousin, the sentence would clearly sound wrong. By applying the same pattern to Shreya, we confirm that the correct form is who is my best friend, not who she is my best friend.

Why Other Options Are Wrong:
Option A uses she who after the name, which produces a double subject and is not accepted in standard English. Option C rearranges the words but still includes who she and breaks the sentence into unnatural parts. Option D claims that all options are correct, but because A and C are ungrammatical, this cannot be true. Hence only option B meets normal grammar rules.

Common Pitfalls:
Learners sometimes repeat pronouns inside relative clauses because they translate directly from their first language or because they feel a second pronoun sounds more natural. Another common mistake is to confuse who is and who she is, thinking that both are acceptable. Exam questions often target this type of redundancy. The safe rule is that when who is the subject of the clause, you do not add another subject pronoun after it.

Final Answer:
The grammatically correct sentence is Shreya, who is my best friend, is a singer. so option B is the right choice.