The correct answer is: C. Angular distance along the observer’s meridian between equator and the observer.
The latitude of a place is the angle between the equatorial plane and the line that passes through the place and the Earth’s center. It is measured in degrees north or south of the equator. The latitude of the observer’s position is the angular distance along the observer’s meridian between the equator and the observer.
The elevation of the elevated pole is the angle between the horizon and the elevated pole. The declination of the observer’s zenith is the angle between the observer’s zenith and the celestial equator.
The elevation of the elevated pole and the declination of the observer’s zenith are not the latitude of the observer’s position. The elevation of the elevated pole depends on the observer’s location on Earth, but it also depends on the time of day and the time of year. The declination of the observer’s zenith depends on the observer’s location on Earth, but it also depends on the time of day.
The latitude of the observer’s position is the only one of the three options that is independent of the time of day and the time of year.