With the help of new technologies, chile's production is so efficient that one hectare of land produces double the grapes that a similar piece of land in France does.

A. double the grapes that a similar piece of land in France does.
B. twice the amount of grapes as a similar piece of land in france does.
C. as much as twice the grapes that a similar piece of French land does.
D. two times as many grapes as there were a similar piece of land in france does.
E. a doubling of the grapes that a similar piece of french land does.

I am confused between A and B. Please explain guys.