The Only Quantities of Good 1 That Barbie Can Buy

The only quantities of good 1 that Barbie can buy are 1 unit or 0 units. For x₁ equal to 0 or 1 and for all positive values of x₂, suppose that Barbie's preferences were represented by the utility function (x₁ + 8) (x₂ + 16) . Then if her income were $4, her reservation price for good 1 would be

A) $4.44.
B) $8.50.
C) $2.22.
D) $.50.
E) $1.90.