The invention of the cotton gin, being one of the most
significant developments of the nineteenth century, had turned
cotton cloth into an affordable commodity even though it was
expensive before that.
A
being one of the most significant developments of the
nineteenth century,
had turned cotton cloth into an
affordable commodity even though it was expensive before
that - "expensive before that" is awkward
B having been one of the most significant developments of
the nineteenth century, turned cotton cloth into an
affordable commodity even though it had previously been
expensive - "having been" is incorrect.
C one of the most significant developments of the nineteenth
century, turned cotton cloth into an affordable commodity
despite its previous expense - "despite its previous expense" is incorrect
D one of the most significant developments of the nineteenth
century,
turned cotton cloth into an affordable commodity
despite the fact that it
had previously been expensive - "one of the most significant developments of the nineteenth century" correctly modifies "The invention of coitton gin". correct tense usage. "
had previously been expensive" and then invention "
turned cotton cloth into an affordable commodity"
E
being one of the most significant developments of the
nineteenth century, turned cotton cloth from a previously
expensive commodity to an affordable one - "to an affordable one" is awkward