The correct answer is: D. No error
The sentence is grammatically correct. The verb “are” agrees with the subject “reverence,” which is a plural noun. The phrase “absorbed while I lived among them” is a participial phrase that modifies the subject “reverence.” The phrase provides additional information about the reverence, but it does not change the subject or the verb.
The sentence could be improved by adding a comma after the word “absorbed.” This would make it clear that the participial phrase is not essential to the meaning of the sentence. The sentence could also be improved by adding a transition word or phrase, such as “in addition to” or “also,” to the beginning of the participial phrase. This would make it clear that the reverence is one of many impressions that the author has of the people of India.