Which question should I Answer
People started learning how to use technology and motors, battery powered things... so back when the pony express was a thing people would use to get around, we didn't know what cars where so people started building structures using aerodynamics so use cars, trucks, and trains now a days
Im pretty sure the answer is B. because when you ask someone if you are going to a party, it is a matter most likely not decided yet, which is the meaning of and open question... hope that helps... :)