American textile companies made up two$-$thirds of all corporations valued over $100,000$ dollars in $1832.$ Why were textile mills so profitable?

a$.$ they used cotton sourced from the free labor of slaves, undercutting other textile producers on the market

b$.$ they made deals with British merchants to have priority in European markets

c$.$ their owners played the stock market and reaped substantial profits

d$.$ the British and French textile manufacturers never recovered from the Napoleonic Wars