Which of These Sentences About SN 1987A Is NOT True

Multiple Choice

Which of these sentences about SN 1987A is NOT true?

A) Bursts of neutrinos were detected at multiple sites from the supernova.
B) The supernova did not become as intrinsically bright as originally expected.
C) The supernova was a white dwarf exploding after mass transfer from a companion star in a binary star system.
D) Observations of the star had been made before it blew up.