Several members of a running club would like to survey the rest of the members to determine which 5K race the club should enter. They decide to sample 10 of the 78 members and have them fill out a survey about their race preference. Which of the following would be a simple random sample?

A simple random sample gives every group of 10 members an equal chance of being selected. In choice A, all names are written on equal-sized slips, mixed by shaking, and then 10 are drawn, so the selection is random and each slip has an equal chance. Drawing slips from the top, as in B and C, may favor slips in particular positions; D mixes the slips but uses scraps of potentially different sizes.

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