How can the user determine whether the projections of the shapefiles are correctly defined?

An ArcGlS user receives two shapefiles that are defined with the same projection and represent features in the same study area. When they are displayed together in ArcMap. the difference of their locations in coordinate space is so large that they are barely visible when viewed at their full extent.

How can the user determine whether the projections of the shapefiles are correctly defined?
A . by comparing the shapefiles to a correctly projected dataset that has a large enough extent to encompass the study area.
B . by systematically changing the spatial reference of the data frame until the shapefiles correctly align.
C . by using the Spatial Adjustment toolbar to move the shapefiles to the same part of coordinate space.
D . by examining the metadata of both shapefiles to determine the projection processes applied to the data1.

Answer: A