When opec stopped shipments of petroleum to the u. s. in 1973, the u. s. did the following except
a. set price controls
b. set a driving curfew
c. determined which days consumers could buy gas
d. set a national speed limit of 55 mph

The correct answer is, indeed, B: Set a driving curfew. This was the only strategy that the U.S., government and the state governments did not impose on Americans, during the Oil Crisis of 1973.

Explanation:

The Oil Crisis of 1973 was a situation that arose when OPEC countries, the main oil producers in the world, decided to limit oil exports to the United States and other countries who had supported Israel against Egypt in the Yom Kippur War, causing a shortage of oil that caused a huge rise of oil prices. The recession was extremely severe all over the world, and especially in the United States, during the Nixon presidency and both the federal government and the state governments were forced to take severe measures to sort out the shortage of gas. Among the strategies used were: the imposition of speed limits to 55 mph, the daylights saving strategy between 1974 and 1975, established the days that drivers could get gas, depending on their plate numbers and established gas price´s controls as people began to be unable to afford gas, since the prices were too high and unemployment was exacerbated.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."