Final answer:
The three variables that determine the extent of an individual's activity space are residential location, occupation, and shopping habits.
Step-by-step explanation:
The three variables that determine the extent of an individual's activity space are Residential location, occupation, and shopping habits.
Residential location refers to where a person lives, which can influence the places they frequent and the distance they travel. Occupation determines the nature of a person's work and may require them to travel extensively or stay in one place. Shopping habits relate to a person's preferences and needs when it comes to purchasing goods and services.