If Demand in the United States Is Given by Q₁

Multiple Choice

if demand in the United States is given by Q₁ = 7,200 - 300p₁, where p₁ is the price in the United States, and if the demand in England is given by 3,600 - 200p₂, where p₂ is the price in England, then the difference between the price charged in England and the price charged in the United States will be

A) $3.
B) $6.
C) $0.
D) $13.
E) $9.