I think that the key point here is the "easily reproducible" - because all of them can be scientific questions (even a! it could tell us about about the human psyche!)
but d. is the best answer for a reproducible experiment. B could also make a good experiment, but it would be too expensive to be easily reproducible. C is calling for a more complex analysis that is too complex for an experiment. And a would require more questionnaires than experiments
The Renaissance – that cultural, political, scientific and intellectual explosion in Europe between the 14th and 17th centuries – represents perhaps the most profoundly important period in human development since the fall of Ancient Rome. ... The Renaissance changed the world in just about every way one could think of
Yes because of the wars and everything that can back it up tell me if u need more help
YOUR ANSWER IS A-TRUE
HOPE I HELPED U!!!!!!!!!!!!!
