Colette and Boris Both Consume the Same Goods in a Pure

Colette and Boris both consume the same goods in a pure exchange economy. Colette is originally endowed with 9 units of good 1 and 6 units of good 2. Boris is originally endowed with 18 units of good 1 and 3 units of good 2. They both have the utility function U(x₁, x₂) = . If we let good 1 be the numeraire, so that p₁ = $1, then what will be the equilibrium price of good 2?

A) $2
B) $12
C) $1
D) $6
E) $3