Can you help with this please

A radio disc jockey asks listeners to call in and name their favorite radio station.

A. population-radio listeners
sample-listeners who call in
possible bias-not all listeners have a favorite station

B. population-radio listeners
sample-listeners who call in
possible bias-listeners already like that station

C. population-everyone in the broadcast range
sample-listeners
possible bias-only those listening will call

D. population-everyone in the broadcast area
sample-listeners who call in
possible bias-not all listeners have time to call in

I would answer B because the people listening to the station most likely already have a preference for it there for are more likely to name that station as their favorite as opposed to a different station.

I would say B.