A Wave on a String,mass Per Unit Length of 0

Multiple Choice

A wave on a string,mass per unit length of 0.2 g/cm,travels in the z direction with the string displaced in the x and y directions as described by the equations
x = 5sin(kx - ωt) cm,and
Y = 5cos(kx - ωt) cm.
The wavelength and the wave velocity are γ = 11 cm and v = 6 cm/s respectively.What average power is transmitted along the string?

A) 3.5 × 10^-5 W
B) 3868 W
C) 8.9 × 10^-7 W
D) 5.9 × 10^-6 W