When Viewing Sexual Orientation as a Spectrum,which of the Following

When viewing sexual orientation as a spectrum,which of the following statements is correct?

A) Bisexuality exists outside the scope of the spectrum.
B) Research revealed a smaller spectrum of sexual orientation than previously known.
C) Seeing sexual orientation as a spectrum weakens the understanding of the complexity of people's attractions.
D) New research on the spectrum of sexual orientation shows the range as well as its causes and expressions.
E) Seeing sexual orientation as a spectrum captures the fact that it can never be changed or vary with time.