Which of the following is true of market social equilibrium if third parties, people outside the market for a good, bear

[answerhappygod]

Which of the following is true of market social equilibrium if
third parties, people outside the market for a good, bear part of
the cost of the good's production? (3 points)
Socially optimal quantity will be greater than the private
quantity, and the socially optimal price will be greater than the
private price.
Socially optimal quantity will be less than the private
quantity, and the socially optimal price will be greater than the
private price.
Socially optimal quantity will equal the private quantity, and
the socially optimal price will equal the private price.
Socially optimal quantity will be less than the private
quantity, and the socially optimal price will be less than the
private price.
Socially optimal quantity will be greater than the private
quantity, and the socially optimal price will be less than the
private price.