What Was the Economic Effect of Napoleon's Continental System

What was the economic effect of Napoleon's Continental System?

A) British merchants prospered, for the French merchants were now barred from British colonies.
B) British merchants and craftsmen lost their major market, deeply harming the British economy and the British tax base for its wars against France.
C) French merchants and manufacturers profited from the monopoly they now held on continental trade.
D) French artisans and the middle class suffered, for they were economically damaged by the blockade of Great Britain.