Answer:
a) External validity
Step-by-step explanation:
External validity: In research methods, the term "external validity" is described as validity that is being utilized for applying the achieved conclusions related to a scientific study or research outside the conditions of the given study or research. In short, it is described as the degree to which the results of particular research or study can be "generalized" across and to any other people, situations, times, and stimuli.
In the question above, the given statement signifies the "external validity".