A shirt rack contains 5 striped shirts, 8 solid shirts, and 6 polka dot shirts. How many outcomes are there when choosing a shirt from the rack?

Choosing one shirt can result in any of the 5 striped, 8 solid, or 6 polka dot shirts. Add the possible shirts: 5 + 8 + 6 = 19. So there are 19 outcomes, which is choice D.

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