Your answer is D asking a question every experiment starts with an question (or something to test) also its not C because that's the second thing you do you come up with an hypothesis then you do a experiment to help prove your hypothesis its not B because you do observations during a experiment when it came down to rather D, or A, I choose D because everything starts with a question you come up with an hypothesis about what you thin it is then you conduct an experiment where you make your observations then you conclude your experiment saying rather your hypothesis is correct or incorrect proving your statement. Your answer is D.
