Directions: The undergiven sentence has been divided into three parts (A), (B) and (C). One of these parts may contain an error. You have to mark that part. If there is no error, mark (D).

Smith's mother (A) died of (B) cancer. (C) No error (D)

The sentence 'Smith's mother died of cancer' is grammatically correct. The possessive 'Smith's mother' is properly formed, the verb tense 'died of' is correct usage for indicating cause of death, and the sentence structure is complete with no errors. This is a straightforward sentence with no grammatical issues requiring correction.