I NEED HELP ASAP ! THANK YOU SMMM

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.

Whether or not a given study has the possibility of causing harm to participants:

Which choice best describes the general trend for the countries shown, for the period 2008 - 2010?