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In this sentence, the error is in the underlined part (C), "were at home." The word "whether" is used to introduce indirect questions, and when it is used in this way, it should be followed by the verb in the singular form. Therefore, the correct sentence should be "whether either of the brothers was at home."
Option 1 (A) is incorrect because there is no error in the underlined part (A).
Option 2 (B) is incorrect because there is no error in the underlined part (B).
Option 3 (C) is the correct answer as it correctly identifies the error in the underlined part and provides the correct version of the sentence.
Option 4 (D) is incorrect because there is an error in the underlined part (C), so it is not "No error."
The provided answer is generally correct, and there is no need for an alert.