The equation of a transverse wave is given by 
         $\mathrm{y}=10\mathrm{sin\pi }(0.01\mathrm{x}-2\mathrm{t})$
where x  and y are in cm and t is in second. Its frequency is

• A

  10 sec^-1

• B

  2 sec^-1

• C

  1 sec^-1

• D

  0.01 sec^-1