(Figure: Capital and Labor XVI) Consider the production function Q = L0.5K0.5, with MPK = L0.5/K0.5 and MPL = K0.5/L0.5. The slope of the isoquant at Point A is

(Figure: Capital and Labor XVI) Consider the production function Q = L0.5K0.5, with MPK = L0.5/K0.5 and MPL = K0.5/L0.5. The slope of the isoquant at Point A is ____.
A) -81
B) 81
C) -9
D) 9