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 correct as it is, then choose option ‘No error’ as your answer response. (Ignore errors of punctuation, if any).

By the time the news (A)/ crew arrived, the (B)/ storm already reached (C)/ its peak intensity. (D)

Correct option is C

The phrase "already reached" is incorrect because the past perfect tense should be used to indicate that the action was completed before another past action.
The correct sentence should be: "By the time the news crew arrived, the storm had already reached its peak intensity."
Rule: Use the past perfect tense (had + past participle) to describe an action that was completed before another action in the past. Here, "had reached" is the correct form.