In the given sentence, identify the segment which contains the grammatical error.
I have made it a point to call my teachers on September 5 as a token of mine gratitude.

Correct option is B

Option (b) contains an error.
Explanation: The word ‘mine’ is a possessive pronoun and is used independently, not before nouns. The correct possessive adjective ‘my’ should be used before “gratitude”.
Correct phrase: ...as a token of my gratitude.
Grammatical Rule Used:
· Use possessive adjectives (my, your, his) before nouns.
· Possessive pronouns (mine, yours, his) are not followed by a noun.
Example:
Incorrect: This is mine book.
Correct: This is my book.