2D Chromatography Is So Named Because ____

2D chromatography is so named because ____.

A) there are two steps: labeling with a radioactive marker and separation via chromatography
B) the molecules are separated into a linear arrangement, meaning two dimensions
C) the process separates the molecules in two directions, first along the x axis and then along the y axis
D) two different solutions are used in the paper chromatography process
E) two different types of radioactive markers must be used