Directions: The sentence contains either a single error or no error at all. If the sentence contains an error, select the one underlined part that must be changed to make the sentence correct. If the sentence is correct, select choice (E). In choosing the answers, follow the requirements of standard written English.

Students (A) will be anxious to discover the uses (B) that can be made of the objects (C) about whom they have (D) studied for the satisfaction of the human needs. (E) No error.