Dr. tylka is conducting research about the risk of developing eating disorders in adolescent boys. she concludes that her findings apply not only to the sample of high school boys she studied, but to other males in other settings and contexts. in this regard, dr. tylka is stating that her findings have high validity.
a, internal
b, construct
c, external
d, split-half

External

Explanation:

External validity:

This is related to the outcomes of the study and can be expected that outcomes can apply in other settings. In other words we can say that how much the validity is generalization in other settings. For example are these findings can be applied to other people, situations, settings, and periods.  

Ecological validity is another example of external validity.  

Factors that can improve validity:

Factors that threaten external validity:

it gave them more rights