By 1910 the top ten industries included printing, malt liquors, tobacc

By 1910 the top ten industries included printing, malt liquors, tobacco cars and railroad cars. The introduction of these new top ten industries indicated

(a) a shift in consumer preferences toward luxury items.
(b) an increase in real incomes in the U.S., permitting people to purchase luxury items.
(c) a smaller percentage of total consumption expenditures on essential food, clothing and shelter.
(d) all of the above.

ANSWER

(d)