The Only Quantities of Good 1 That Irene Can Buy

The only quantities of good 1 that Irene can buy are 1 unit or 0 units. For all positive values of x₂, Irene's preferences are represented by the utility function (x₁ + 10) (x₂ + 2) . If her income is $8 and the price of good 2 is $1, then Irene's reservation price for good 1 is

A) $1.82.
B) $1.50.
C) $.91.
D) $5.
E) $.10.