A bag of marbles contains 4 green marbles, 3 blue marbles, 2 red marbles, and 5 yellow marbles. How many total possible outcomes are there when choosing a marble from the bag?

Each marble is one possible outcome when a single marble is chosen. Add the marbles of all four colors: 4 + 3 + 2 + 5 = 14. Therefore, there are 14 total possible outcomes, which is choice C.

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