This Photograph Shows Light-Colored Granite and Darker Diorite Both Igneous

This photograph shows light-colored granite and darker diorite both igneous rocks) . Which of the following statements is true?

A) the light-colored unit is younger because granite is more continental than diorite
B) the diorite is older because its weathered surfaces are darker
C) the granite is younger because it crosscuts the diorite
D) all of these