Question

Identify the incorrect sentence/sentences.
A) It is important to monitor the groups.
B) Check that the instructions are clear, and tell the students to begin.
C) Inefficient bus service are a hazard.
D) Traffic in the city has reached unsustainable levels.

• A. A
• B. B
• C. C
• D. D

Hint:

Always check subject-verb agreement carefully — singular subjects require singular verbs, even when modifiers like "service" or "traffic" describe a collective idea.

Answer 1

The Correct Option is C

Step 1: Examine sentence A "It is important to monitor the groups." — This is grammatically correct. The subject ("It") and predicate ("is important to monitor the groups") agree and the sentence is clear. \[ \Rightarrow \text{Correct} \] Step 2: Examine sentence B "Check that the instructions are clear, and tell the students to begin." — This is also correct. The imperative form is appropriate, punctuation is correct, and there is no subject-verb disagreement. \[ \Rightarrow \text{Correct} \] Step 3: Examine sentence C "Inefficient bus service are a hazard." — Here, the subject "bus service" is singular, so the verb should be "is" instead of "are." The correct sentence would be: \[ \text{"Inefficient bus service is a hazard."} \] Thus, sentence C is grammatically incorrect due to subject-verb agreement error. \[ \Rightarrow \text{Incorrect} \] Step 4: Examine sentence D "Traffic in the city has reached unsustainable levels." — This is correct. The subject "Traffic" is singular and matches the verb "has reached." The phrase "unsustainable levels" is appropriate and clear. \[ \Rightarrow \text{Correct} \] Step 5: Conclusion Only sentence C is incorrect due to singular subject and plural verb mismatch. \[ \boxed{\text{C}} \]