A particle moves in the X-Y plane under the influence of force such that its linear momentum is\[\vec{p}(t)=-A[\hat{i}\cos (kt)-\hat{j}\sin (kt)]\], where A and k are constants. The angle between the force and the momentum is

• A. \[0{}^\circ \]
• B. \[30{}^\circ \]  
• C. \[45{}^\circ \]
• D. \[90{}^\circ \]