Which one is it ?

Question : which of the following is a response cause by external stimulus
1) vomiting due to a virus
2) running away when frightened
3) release of hormones to regulate blood sugar levels
4) clipping toe nails

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above