Perhaps the greatest way in which these two time periods were similar is in terms of intolerant attitudes. Both we periods of great discrimination against minorities and women. The 1950s saw far more of a literary revival than the 20s.
The correct answer should be the third one you listed. The "current drag" then is a device that is used in order to measure the sub-surface currents. This device and the measurements it provides are extremely important for the field of oceanography which studies the aspects of the oceans both the physical and the biological ones.
Alot of people in Europe were not educated because you had to have money to go to school and learn for example math the hard types so, the Europeans heard that there was people that were down south in the Arab region learning together the Europeans didn't even know where the number 0 came from they found out that it was first brought by the very intelligent scholars that were influenced by Isalm and the roots of the arab culure.
hopefully that helps
