Answer: Harry Hammond Hess
Harry Hammond Hess was a geologist. He is one founding fathers of the unifying theory of plate tectonics. He discovered the flat-topped submarine volcanoes, which he termed guyots. His hypothesis on seafloor-spreading was supported by scientists because, the
ocean floor increased dramatically during his lifetime.
SAT tests are created to confuse you, but don't worry! Here's my answer: Identifying an alternate route before you need one. Every Uber or Taxi driver is forced to do so before taking a road. Hope this helps!
The answer is 1/639, since there are 639 chips, and only one of them is 539.
C has to be the answer plane and train crashes are much rarer