English Grammar — Error Spotting (Subject–Verb Agreement with Measurements) Identify the part that contains a grammatical error. If there is no error, choose 'No error'. Full sentence: Ten kilometres are a long distance.

Introduction / Context:This question tests subject–verb agreement when a measurement or amount is treated as a single unit. In such cases, singular verb agreement is required.

Given Data / Assumptions:

• Sentence: "Ten kilometres are a long distance."
• Measurement phrase acts as a singular quantity.

Concept / Approach:

When a number + unit denotes a single distance, time, or amount, it is considered singular: "Ten kilometres is..." Similarly, "Five minutes is a short wait."

Step-by-Step Solution:

1) Identify the head concept: a distance as a single unit.2) Apply singular agreement: choose "is" not "are".3) Therefore, part B is erroneous.

Verification / Alternative check:

Corrected: "Ten kilometres is a long distance." This aligns with standard grammar references for measures and amounts.

Why Other Options Are Wrong:

A: Correct noun phrase indicating the measure.C: Article "a" is appropriate before "long distance."D: Noun complement is fine.E: Not applicable since B contains the error.

Common Pitfalls:

Learners often match the verb to the plural form of the unit ("kilometres") rather than to the conceptual singular measure. Always check whether the phrase denotes a single amount.

Final Answer:

are