Which situation does NOT describe a uniform probability model?

Responses
A A spinner has 4 equal sectors colored yellow, blue, green and red.
B The probability of each outcome when a dime is tossed.
C The probability of each outcome when a single 6-sided die is rolled.
D A glass jar contains 1 red, 3 green, 2 blue and 4 yellow marbles.

D A glass jar contains 1 red, 3 green, 2 blue and 4 yellow marbles. (This is not a uniform probability model because the marbles have different probabilities of being chosen.)