which of these is an example of systematic random

UNIT 1- CHALLENGE 2: Sampling Which of these is an example of systematic random sample? a.) Choosing 10 marbles from a jar containing 40 marbles. b.) Picking out the telephone number of every 20th person O from a directory. c.) Picking out 10 names from a group of 50 studer d.) Selecting one card from a deck of 52 well-shuffled cards SUBMIT ON ANSWER OLI