Pushing force making an angle \[\theta \]to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is\[\phi \] , the magnitude of force required to move the body is equal to

• A.  \[\frac{W\,\cos \phi }{\cos \,(\theta -\phi )}\]  
• B.         \[\frac{W\,\sin \phi }{\cos \,(\theta -\phi )}\]
• C.  \[\frac{W\,\tan \phi }{\sin (\theta -\phi )}\]       
• D.         \[\frac{W\,\sin \phi }{g\sin (\theta -\phi )}\]
• E.        None of these