A region normally has a horizontal geomagnetic field of 25μT pointing toward geographic north. A nearby ferromagnetic ore body adds an additional horizontal field of 10μT directed due east. Ignoring any vertical components, in which direction will a freely pivoting compass needle point?
a) 14∘ east of geographic north
b) 67∘ east of geographic north
c) 22∘ east of geographic north
d) 22∘ west of geographic north