Directions: The sentence given below is divided into four parts (A), (B), (C) and (D). One of these parts may contain an error. You have to indicate that part as your answer. If there is no error, mark (E) as your answer.

(A) To keep the elephants (B) in good physical condition, the keeper trims their tusks with (C) a hacksaw every three years and oils their hides (D) once a year so that their skin won’t crack. (E) No error