How did american business in the 1920s attempt to solve the problem of developing enormous universal markets for its mass-produced goods?
a. american business developed a large range of product variations.
b. american business nurtured the birth and development of consumer advertising.
c. american business engaged in fierce price-competition wars.
d. american business introduced direct selling through catalogues and door-to-door solicitations.
e. american business offered government-backed guarantees on product performance.