Answer:
Differential sensitivity theory
Step-by-step explanation:
Differential sensitivity theory: According to the differential sensitivity theory, the researcher has demonstrated that an individual having specific genetic makeups are comparatively more sensitive or influenced to unfavorable or favorable environmental factors than that of an individual without that genetic makeup.
In other words, every individual varies in terms of sensitivity to the environment.
In the question above, the different life outcomes of Marissa and Jessica can be explained through the differential sensitivity theory.