If Curves of Intensity Versus Wavelength Are Plotted for a Single

Multiple Choice

If curves of intensity versus wavelength are plotted for a single object at various temperatures, it is found that the curves never cross. Why is this important?

A) If the curves do not cross, then the object is not a blackbody.
B) The only situation in which the curves do not cross is when the source is a neutron star-essentially an atomic nucleus the size of a star.
C) If the curves do not cross it means that monochromatic light has been emitted from the source.
D) Because each curve is unique, in theory it is possible to determine the temperature from a single point on a blackbody curve.