Question

which amendment allowed the federal government to collect income tax, fulfilling a populist demand?
a. 18th amendment
b. 19th amendment
c. 16th amendment
d. 17th amendment

Explanation:

The 16th Amendment to the United States Constitution gives Congress the power to collect income tax without apportioning it among the states or basing it on the United States Census. The 18th Amendment was about Prohibition, the 19th about women's suffrage, and the 17th about direct election of senators. So the amendment that allowed federal income tax collection is the 16th Amendment.

Answer:

c. 16th Amendment