Marianne collects coffee mugs from places she visits when she goes on vacation. she displays her 87 coffee mugs over her cabinets in her kitchen, including 8 mugs from texas, 4 from georgia, 4 from sc and 8 from california. if one of the coffee mugs accidentally falls to the ground and breaks, what is the probability that it is a california coffee mug?
a. 8/87
b. 4/87
c. 4/39
d. 1/13