What Equation Has The Flattest Slope?

Y = 1/2x - 2, Y = 4x-1, Y = 2x, Y = 2x + 3? And Why?

A (Y = 1/2x - 2) would be the correct answer.

Reason 1: It has the smallest slope number out of all of them (1/2)

Reason 2: When graphed, it can readily be seen that the line with 1/2 slope is the most "flattest" or closest to being horizontal. The red line is the flattest.