Answer:
C. saw Republicans win control of both houses of Congress.
Explanation:
Elections into the United States House of Representatives for the 80th United States Congress took place in 1946. The election was held 19 months after President Harry S. Truman assumes office upon the death of Franklin D. Roosevelt.
The Democrats held control of Congress since 1931, and for 16 years, President Roosevelt had been elected in office for a record four terms.
The 1946 election resulted in Republican picking up 55 seats to win majority control of the Congress. Joseph William Martin Jr, a Republican congressman of Massachusetts, became the sheet of the house, exchanging places with Sam Rayburn, a democrat congressman of Texas, who then became the new minority leader.