Read each sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is grammatically and contextually correct, then choose “No error” as the correct answer. (Ignore errors of punctuation, if any.)

The team are (A) / planning to win (B) / its next match (C) / against the strongest opponent. (D)

Correct option is A

The sentence has a grammatical error in part (A).
In this sentence, the subject "The team" is singular, and therefore, the correct verb to use is "is" (singular form of the verb "to be") instead of "are" (plural form of the verb "to be").
Subject-verb agreement means that the verb used in a sentence must agree in number (singular or plural) with the subject of the sentence. If the subject is singular, the verb must be singular, and if the subject is plural, the verb must be plural.
Therefore, the correct verb to use in part (A) is "is" instead of "are".
Hence, the correct sentence formed will be "The team is planning to win its next match against the strongest opponent."