Help ASAP with my socials like right now!

Answer quickly! correct answers only! how did an agricultural surplus relate to expanded trade during the high middle ages? a)trade increased because surplus crops could be traded. b)trade decreased because surplus crops were needed to feed local populations. c)trade decreased because surplus crops led to an oversupply of grains that could not be sold. d)trade increased regionally but decreased globally because trade networks had shrunk.

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?

Marcy tests a solution with a strip of blue litmus paper. the paper turns red. the solution is acidic basic neutral