What Is the Main Observational Difference Between a Type Ia

Multiple Choice

What is the main observational difference between a Type Ia and a Type II supernova?

A) Hydrogen lines are prominent in the spectrum of a Type Ia supernova but absent in that of a Type II.
B) The spectrum of a Type II supernova shows strong lines of both hydrogen and helium, whereas that of a Type Ia shows only hydrogen.
C) The spectrum of a Type Ia supernova shows strong lines of both hydrogen and helium, whereas that of a Type II shows only hydrogen.
D) Hydrogen lines are prominent in the spectrum of a Type II supernova but absent in that of a Type Ia.