The manager of a bagel shop wants to add some new flavors that will appeal to his customers. Which surveying method is most likely to produce a representative sample of the bagel shop's customers?

Any sample would need to be random. However, we can assume that people may come to the bagel shop at all times it is open, and their opinions would be different from others. So, we should take a stratified sample of each hour the bagel shop is open. For example, we would randomly select a number of customers from 8 - 9, say, and continue that process for each hour the bagel shop is open.

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answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.