Which of these wagers would you be most comfortable making?

I have 3 sets of dice giving different odds. Let’s say once a week for the rest of the year a portion of your paycheck will be taken out and granted to a forest elf named Griffy. Which set of dice do you wish Griffy to roll? (all profits return to you)

A. Risk $10 – with a 31% chance of making a profit of $20
B. Risk $20 – with a 47% chance of making a profit of $20
C. Risk $40 – with a 63% chance of making a profit of $20