When a body is placed on a rough plane inclined at an angle \[\theta \] to the horizontal, its acceleration is

• A.                         \[g(\sin \theta -\cos \theta )\]            
• B.                           \[g(\sin \theta -\mu \cos \theta )\]            
• C.                         \[g(\mu \sin \theta 1-\cos \theta )\]                   
• D.                         \[g\mu (\sin \theta -\cos \theta )\]