From the Horizon to the Observer's Zenith Is an Angle

Multiple Choice

From the horizon to the observer's zenith is an angle of

A) 90 degrees for everyone on the Earth.
B) 23.5 degrees for observers at the Tropics of Cancer and Capricorn.
C) 0.0 degrees for an observer at the Earth's north pole.
D) 66.5 degrees for everyone on the Earth.
E) 30 degrees for observers at a latitude of 30 degrees north.