The Slope of a Country's Production Possibility Frontier Is Equal

The slope of a country's production possibility frontier is equal to ________ and the optimal production point is located where the slope is equal to ________.Assume that output of good Y is measured on the vertical axis,output of good X is measured on the horizontal axis,MPL is the marginal product of labor with a subscript indicating which good,P is the price of a good,and w is the wage rate.

A) -MPLY/MPLX; -PX/PY
B) -PX/PY; -MPLY/MPLX;
C) -PX/w; -PY/w
D) -MPLY/w; -MPLF/w
E) -MPLX/MPLY; -PX/PY