Sentence Correction

Section 301 of the 1988 omnibus trade and competitiveness act enables the united state trade representative to single out a country as an unfair trader, begin trade negotiation with that country, and , if the negotiation do not conclude by the united states government's being satisfied, to impose sanctions.

A) by the united states government's being satisfied, to impose

B) by the united state government's satisfaction impose

C) with the united states government's being satisfied, imposing

D) to the united states government's satisfaction, impose

E) to the united states government's satisfaction, imposing

OAD

Please explain.

Thanks..

I also would appreciate some help here.

What is the difference between impose and imposing?