The sentence below has four parts (A, B, C, and D). One part has a grammatical error. Identify the part.
Insulin secretes (A)/ in response to (B)/ rising levels of glucose (C)/ in the blood. (D)

Correct option is C

Option (c) contains the grammatical error.
Explanation:
The verb “ secretes” is transitive, which means it must be used with a subject that performs the action, not the hormone itself.
Correct usage: “Insulin is secreted” (passive voice) because insulin is produced, it doesn’t produce itself.
Correct sentence:
Insulin is secreted in response to rising levels of glucose in the blood.
Grammatical Rule Used:
Use passive voice when the subject receives the action rather than doing it.
Example:
· Incorrect: Glucose produces automatically.
· Correct: Glucose is produced automatically.