Answer B verse answer E

Because of the recent transformation of the market, Quore, Inc., must increase productivity 10 percent over the course of the next two years, or it will certainly go bankrupt. In fact, however, Quore's production structure is such that if a 10 percent productivity increase is possible, then a 20 percent increase is attainable. If the statements above are true, which one of the following must on the basis of them also be true? B: Quore will not go bankrupt if it achieves a productivity increase of 20 percent over the next two years. 20%increase --> ~B [B---> ~20% increase] E:If a 20 percent productivity increase is unattainable for Quore, then it must go bankrupt. ~20%increase ---> B [~B----> 20%increase] Hi I am confused on the difference between answer B and answer E? For answer B: Wouldn't having a 20% increase mean a 10% increase has already been met, which would keep it from going bankrupt? But the question asks for the answer that must be true, so what scenario or in what way does answer B not stand true in all cases? I understand answer E, but I don't understand why answer B does not work either.