Three roommates - Tim, Jeff and Mark - all live in the same apartment in Michigan (where winters can be really cold). During the winter they are considering turning up the thermostat in their apartment by 1, 2, 3 or 4 degrees. They know that each time they raise the temperature by one degree their heating bill goes up $8. Their individual marginal benefits from making it warmer in the apartment are as follows: Tim Mark Jeff 1 degree $5 $3 2 degrees 83 $2 3 degrees $3 $2 $1 4 degrees $2 $1 A. Find the marginal social benefit from raising the temperature by 1, 2, 3, and 4 degrees. B. What is the optimal temperature to raise the temperature? Explain