Two waves are represented by the equations \[{{y}_{1}}=a\sin (\omega t+kx+0.57)m\] and \[{{y}_{2}}=a\cos \]\[(\omega t+kx)m\], where x is in meter and t in sec. The phase difference between them is

• A. 1.0 radian
• B. 1.25 radian
• C. 1.57 radian
• D. 0.57 radian