The most likely substitute good for cereal would be: a bagel.
What is a substitute good?
This is the term that is used to refer to the good that can be used to take the place of another good. It is the good that has the ability of satisfying the same need as a former good. Hence when the price of the other good is too high this good would be used to take its place.
In terms of breakfast, people are able to substitute eating of cereals for bagels. They would be able to take care of the same need.
Read more on substitute goods here: https://brainly.com/question/15329989
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