Because map projections must turn a 3-d world into a 2-d map, they will always have the problem of a. accuracy b. distortion c. estimation d. elevation

Because map projections must turn a 3-D world into a 2-D map, they will always have the problem of: distortion
Converting maps from 3-D into 2-D will often cause some sort of misshape of the map, even though the distance and the size projection between the maps maybe accurate