Buyer $1$: First Unit $65,$ Second unit $50,$ Third unit $25$

Buyer $2$: First Unit $35,$ Second unit $25,$ Third unit $0$

Buyer $3$: First Unit $65,$ Second unit $35,$ Third unit $25$

Seller $1$: First Unit $5,$ Second unit $10,$ Third unit $45,$ Fourth unit $60$

Seller $2$: First Unit $5,$ Second unit $10,$ Third unit $30,$ Fourth unit $45$

The tables show reservation values of buyers and sellers in a market. There are three buyers and two sellers. Each$$ buyer's reservation values for the fourth unit and above are$$ negative, and each seller can produce at most four units.

Suppose that Buyer $1$ buys the first unit of Seller$1,$ Buyer $2$ buys the first unit of Seller$2,$ and Buyer $3$ buys the second and the third units of Seller $2.$ What is the social$$ surplus?

Part $2$

A$.$

$$$$186$

B$.$

$$$$168$

C$.$

$$$$171$

D$.$

$$$$187$