The Idea That a 1% Increase in the Output Gap

The idea that a 1% increase in the output gap will lead to a decrease in the unemployment rate of 0.5% is known as _____ law.

A) Okun's
B) Okun's.
C) Phillips's
D) Phillips's.
E) Greenspan's
F) Greenspan's.
G) Keynes's
H) Keynes's.