How Has the Maximum Intrinsic Brightness (Minimum Absolute Magnitude)of Type

How has the maximum intrinsic brightness (minimum absolute magnitude) of Type Ia supernovae been measured?

A) The distances to nearby Type Ia supernovae have been measured using trigonometric parallax.
B) Type Ia supernovae have been observed in distant galaxies in which Cepheid variables have also been observed.
C) The brightnesses of Type Ia supernovae have been measured at several different wavelengths, from which their temperature and hence their intrinsic brightnesses can be calculated.
D) The brightnesses of several Type Ia supernovae have been accurately measured relative to the brightnesses of the original stars before they exploded.

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