Read the sentence below to find out if there is any error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. (Ignore errors in punctuation if any).
Mr. Rawat quit on Friday evening ostensible (A)/ on being unable to get elected to the Uttarakhand Assembly (B)/ within the constitutionally stipulated (C)/ deadline of six months from the date he took over.(D)/ No error (E)