I'll give brainiest , 5 stares help​

number 3

Step-by-step explanation:

When some members of your population aren't represented in a sample, it's called undercoverage. ... It's a type of selection bias that often occurs in convenience sampling, where you collect a sample that's easy to obtain, like shoppers at your local mall or residents at a town meeting.

i would say c is the best answer, hope it's right!

good luck! =)

cutie~