In Mexico City, only 55-60% of the population owns a telephone. The number drops to less than 50% in Guadalajara and Monterey, and 35% or lower in other cities. This will complicate the task of market researchers hoping to use a telephone survey to obtain a ________ of the Mexican population.
A) probability sample
B) convenience sample
C) secondary sample
D) focus group sample
E) quota sample
Answer: A) probability sample