Answer:
The correct option is;
a. Moderation
Explanation:
Here we have that the analysis is to check the hypothesis that drinking caffeine would exacerbate the effect of sleep disturbance caused worry is a form of moderator analysis.
A moderator analysis is one in which we attempt to determine if the relationship between two investigated variables is dependent on the magnitude or presence of a third variable. We refer to the third variable as the moderator or moderator variable.