Beekeepers' demand curve for beehives is = 36 . The supply curve for beehives is given by = 2. Bees from beekeepers' beehives increase the pollination of local gardeners plants. Local gardeners value the external benefit of the increased pollination from a beehive at $12. What is the marginal benefit of society (MBS) curve for this market?

a.) =36

b.) =48

c.) =2

d.) =12+2