Answer:A) face validity
Explanation:Face validity, which is also referred to as logic validity is when you use a surface and subjective method ( asking people's opinions ) to asses if the study actual test what it claims to taste. This when you browse through the surface to find an opinion about something.
It is easiest way because you don't have to look for objective measures but this makes it a weak form of validity. Subjective measurement can be bias.