GMAT Sentence Correction (SC) | Re: Receiver of Wreck is an official of the British government

Receiver of Wreck is an official of the British government whose main taskwas to process incoming reports of shipwrecks so as to give legitimate owners the opportunity of retrieving their property and ensure that law abiding finders of wreck receive an appropriate reward

A. was to process incoming reports of shipwrecks so as to give legitimate owners the opportunity of retrieving their property and ensure that law-abiding finders of wreck receive
B. had been processing of incoming reports of