Answer:
The type of sampling used here is Systematic Sampling.
Step-by-step explanation:
Systematic Sampling:
It is such a type of sampling in which items, things or people etc are selected randomly but at specific interval.
In our case, Karen decided to choose every 100th person from white pages as that person can be any one so random and 100th person show us a specific interval.
- It is a simple method but can be time consuming.