What was the crucial factor permitting cotton textile production to ta

What was the crucial factor permitting cotton textile production to take off in New England between 1790 and 1815?

(a) The imposition of high tariff rates
(b) A lowering of import tariffs by Britain
(c) The blocking of trade with England through the Embargo and
the War of 1812
(d) A relaxation of regulations restricting exports of machinery
by Britain

ANSWER

(a)