When We See X-Rays from an Accretion Disk in a Binary

When we see X-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?

A) Intense X-ray bursts
B) Spectral lines from the companion star that alternately shift to shorter and longer wavelengths
C) Visible and ultraviolet light from the companion star
D) Bright X-ray emission that varies on a time scale of a few hours

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