Identify the part of the sentence that contains an error.
Honesty / is / a best / policy.

Correct option is A

Option (a) contains an error.
Explanation: The article “a” cannot be used with a superlative adjective like “best.” The correct structure is “the best policy.”
Correct sentence: Honesty is the best policy.
Grammatical Rule Used: Use “the” before superlative adjectives.
Example: She is the fastest runner in school.
�� Article Rule: "The" is used before superlatives (best, worst, tallest, etc.).