At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be [SCRA 1994; DCE 2001; MP PMT 2002]

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