Final answer:
The probability of picking a card with a heart on it from a standard deck of playing cards is 1/4 or 25%.
Step-by-step explanation:
To find the probability of picking a card with a heart on it, we need to know the total number of cards and the number of cards with a heart. In a standard deck of playing cards, there are 52 cards and 13 hearts.
Thus, the probability of picking a card with a heart on it is 13/52, which simplifies to 1/4.
Therefore, the answer is c. 1/2.