What Change in Spectral Lines Emitted by Atoms Is Described

Multiple Choice

What change in spectral lines emitted by atoms is described by the Zeeman effect?

A) broadening of the lines associated with the high temperature of the emitting gas
B) change in relative intensity of different lines from sources of different temperature
C) shift in the lines because of the movement of the source
D) splitting of lines because the atoms are within an intense magnetic field