Direction: Read the given sentence to find out whether there is any grammatical/contextual error in it. The error, if any, will be in one part of the sentence. If no part in the sentence has an error then, mark 'No Error' as your answer. Consider the part in bold as grammatically correct. (Ignore punctuation errors, if any).

Ancient Rome's greatest (A) / general Julius Caesar was (B) / infamously betrayed by (C)/his step-son Brutus, who (D) / he considered his successor.