The question asks what a civil court can do under the Code of Civil Procedure, 1908 when it finds parts of the pleadings unnecessary and likely to prejudice or delay a fair trial. Order VI Rule 16 answers this, and each option needs to be tested against what that rule actually authorises.
Only the option describing a strike-out available at any stage matches both the substance and the timing built into Order VI Rule 16.
Therefore, the correct answer is Strike out such pleadings at any stage of proceedings.