Need help with this activity:

Question

Imagine that in your backpack you have several writing implements, all of which are the same size: 2 lápices, 5 bolígrafros, 3 marcadores. If you pull one out at random, what is the percent probability that it will be a marker?

a. 20%
b. 50%
c. 30%
d. 100%
C?

Thanks
-MC