A wave travelling along positive x -axis is given by `y = A sin (omega t- kx)`. If it is reflected from rigid boundary such that 80% amplitude is reflected, then equation of reflected wave is
A. `y = A sin(omega t+kx)`
B. `y = -0.8 A sin(omega t+kx)`
C. `y = 0.8 A sin (omega t+kx)`
D. `y = A sin (omega t+0.8 kx)`
