In 2017, which category represented the largest source of receipts for the U.S. federal government?

A) Medicare
B) Social Security
C) Tariffs
D) Personal income taxes

In 2017, personal income taxes represented the largest source of receipts for the U.S. federal government, accounting for a significant portion of the federal revenue. Social Security, Medicare, and tariffs also contribute to federal revenue, but personal income taxes are typically the largest single source.