The correct answer is: E. No error
The sentence is grammatically correct. The verb “keep” is used in the present tense to describe an action that is repeated regularly. The object of the verb “keep” is “telling,” which is a gerund phrase that functions as the subject of the sentence. The direct object of the verb “telling” is “his friends,” and the object of the preposition “that” is “he wants to go abroad.”
The sentence could be rewritten as follows:
Day in and day out, he tells his friends that he wants to go abroad.
However, the original sentence is grammatically correct and does not require any changes.