Which type of study best describes the following research most likely to be done?

a test is being conducted on a new medicine that is supposed to heal cuts faster. one group is given the actual medicine in a gel type of ointment to apply to the cuts. the second group is given just regular vaseline that looks like the medicine but has not benefit to put on the cut. the results are then compared.

group of answer choices
a) experimental study
b) observational study
c) simulation study
d) census
e) sampling