The plesiosaur flipper is convergent with other flipper forms becuase even though they don't share the same evolutionary path, in other words, they don't have a common ancestor with flippers, different animals reached to a simmilar structure with the same function that is locomotion in water.
I think it's d but I'm not sure!!
There are several different processes, including glycolysis and the Calvin Cycle, but the umbrella term for getting energy from glucose is cellular respiration.