Parts of the following sentence are given as options. Identify the segment that contains a grammatical error.
I am indebted to my friends for the large sum of money what they gave me during my days of need.

Correct option is A

The segment of the sentence that contains a grammatical error is option (a) what they gave me.
Explanation:
· The correct relative pronoun to use in this context is "that," not "what." The word "what" is incorrect because "what" refers to something unknown or unspecified, whereas "that" correctly introduces a restrictive clause specifying the sum of money given.
· Corrected Sentence:
"I am indebted to my friends for the large sum of money that they gave me during my days of need."
Grammatical Rule Involved:
· Relative Pronouns: In restrictive (defining) relative clauses, "that" is used to introduce essential information that defines the subject. "What" is not used as a relative pronoun in this type of clause.
Example for Clarity:
· Correct: "The book that you lent me was very interesting."
· Incorrect: "The book what you lent me was very interesting."