Study the graph A double bar graph titled Nuclear Weapon Stockpiles. The x-axis is labeled 1950, 1955, 1960, and 1965. The y-axis is labeled Number of Weapons from 0 to 40,000. The U S bar is on the left and the U S S R bar is on the right. In 1950, both countries are near 0. In 1960, the U S had 20,000 weapons and the U S S R has around 1,000 weapons. In 1965, the U S has over 30,000 weapons and the U S S R has over 5,000.

Which conclusion best summarizes the information in the graph?

a. The US stopped building nuclear weapons in 1965.
b. The USSR held an advantage in the arms race when it began in 1950.
c. The USSR began to catch up to the US in nuclear weapons production after 1960.
d. The US developed many more nuclear weapons than the USSR between 1950 and 1965.