The model below represents the apparent path of the sun across the sky on march 21 as seen by an observer on earth.
at which latitude is the observer located?
(1) 90° n
(2) 42° n
(3) 23.5° n
(4) 0°

By looking at the model/graph you posted, when the path of the sun is across the sky on March 21, the observer that is located on earth is located at the latitude 0. The correct answer choice will be number 4.