This Plot Shows a Mass Oscillating as X = X_m

Multiple Choice

This plot shows a mass oscillating as x = x_m cos (ωt + φ) .What are x_m and φ?

A) 1 m, 0°
B) 2 m, 0°
C) 2 m, 90°
D) 4 m, 0°
E) 4 m, 90°