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In this question, we are asked to identify any errors in the underlined parts of the given sentence. The sentence is: "He had arrived at Cairo a few months before protests shook the Arab world."
Option 1 (A): The underlined part "at Cairo" is grammatically correct. This describes the specific location where the person arrived. Therefore, there is no error in part A.
Option 2 (B): The underlined part "a few months before" is also grammatically correct. It indicates the timeframe when the person arrived in Cairo. So, there is no error in part B.
Option 3 (C): The underlined part "protests shook the Arab world" is grammatically correct. It describes the situation that occurred after the person arrived in Cairo. Therefore, there is no error in part C.
Option 4 (D): The underlined part "No error" indicates that there are no errors in the sentence.
Since options 1, 2, and 3 do not contain errors and option 4 is not applicable, the correct answer is option 1.
Alert - correct answer should be option 4 as there are no errors in the sentence.