Question 10 5 pts Yennefer of Vengerberg is a talented witch. The graph below shows the marginal private cost (MC) and marginal private benefit (MB) she and her fellow witches get from casting spells. Unfortunately, their magic also has negative externalities. Use this graph for all questions with the title "Yenn from Ven". 10 MC 9 8 6 5 4 3 2 MB 0 100 200 300 400 500 600 700 800 900 1000 Spells Cast (Yenn from Ven) If the socially optimal quantity is 450, what is the correct Pigouvian tax per unit? $1.00 O $0.50 $3.00 O $150