There is an error in a part of the sentence given below : (A) the doors (B) are very strong (C) as they are (D) made up (E) on fire wood Choose the correct answer from the options given below :

(B) Only (C) Only (D) Only (E) Only

(E) Only

The error is in part (E) "on fire wood." The correct preposition should be "of" instead of "on."