किसी कर्मचारी/अधिकारी को किस आधार पर हिंदी का कार्यसाधक ज्ञान प्राप्त माना जायेगा?

The more money the governments pored into it, the harder it was to walk away. 

Surely, she must feel bitter on (A)/ that fact, and yet neither her voice or (B)/ her expression gave any indication (C)/ that she felt antipathetic. (D)

Identify the segment in the sentence that contains a grammatical error-

He promises, I'll call you as soon as I get home.

There was once library (A)/ in Mylapore that imposed rules (B) / on how a reader must position a book while reading. (C) / No error. (D) 

The brilliant administrator was destined for the post of Assistant Commissioner; there was no one to challenge his caliber.

It is about time we tell you that you should start preparing for the exam sincerely.

Find the appropriate answer.

Identify the segment that contains a grammatical error. If there is no error, select 'No error'.