Multiple choice Directions: Identify the part having an error. If no part has an error, mark (5). The cost of essential commodities have spiralled very high No error Reveal answer Fill a bubble to check yourself C Correct answer Explanation The subject 'cost' is a singular noun, but the verb 'have' is plural. This violates subject-verb agreement rules. The correct verb should be 'has' to match the singular subject 'cost'.