I believe it is the second one.
It provided a source of power for many kinds of machines.
Anti-war marches and other protests, such as the ones organized by Students for a Democratic Society (SDS), attracted a widening base of support over the next three years, peaking in early 1968 after the successful Tet Offensive by North Vietnamese troops proved that war's end was nowhere in sight.
Well, I am pretty sure that the correct answers will be C and D. This is because when people had traveled with Marco Polo they had seen all of the opportunity that they were missing when they weren't trading what they had traded with the Orient when they first started. The Crusades influenced a lot of people to start trading with others I personally think that they forced some people to do it but we don't know that for sure.
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The last time the rivalry determined a Big Ten Conference champion was in 1962 when #3 Wisconsin defeated #5 Minnesota for a berth to the 1963 Rose Bowl. Wisconsin won 14 straight meetings against Minnesota, from 2004 to 2017, before the Gophers beat the Badgers in their 2018 matchup.
