Answer:
The correct answer is B.
Explanation:
Picking a card at random from a set of three cards is the most accurate way to simulate the situation. Each card could represent a different clothing option, giving a (theoretical) 1/3 probability of selecting any given outcome, including the pair of jeans.
In addition, answer B is the only choice that could simulate a situation with three outcomes. Coins and bottle caps only have two sides and a number generator would need to be limited to a multiple of 3 (3, 6, 9, 12...).