Answer: c) Functional relation.
Step-by-step explanation:
Functional relation is defined as situation in which a variable tends to get change or manipulated according to the other variable's value. Changes that cause change in dependent event through the alteration made in independent variable display functional relation.
Other options are incorrect because creation of any hypothetical plot and explanatory fiction are not the terms for creating alteration in independent variable to observe manipulation in dependent component.Thus, the correct option is option(c).