This is a subjunctive problem. The intial verb is one of command (require) do we have to use a that and put the second verb in the subjunctive mood - the simple form (be, do have, go, etc.). So, we can eliminate B and D for no that and no "pay". We can also eliminate C for the use of their referring to the word company. And E has a very awkward structure: whose actions? The correct answer is A.
"Start By Doing What Is Necessary ,Then What Is Possible & Suddenly You Will Realise That You Are Doing The Impossible"