A dip needle lies initially in the magnetic meridian when it shows an angle of dip q at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip \[{\theta }'\]. Then \[\frac{\tan {\theta }'}{\tan \theta }\] is

• A.            \[\frac{1}{\cos x}\]            
• B.            \[\frac{1}{\sin x}\]
• C.            \[\frac{1}{\tan x}\]            
• D.            \[\cos x\]