The Solar Neutrino Problem Was Solved by Postulating That

The solar neutrino problem was solved by postulating that

A) neutrinos have a very large mass.
B) neutrinos oscillate between three different types.
C) some neutrinos become photons during their journey.
D) some neutrinos interact more strongly with matter such that they are absorbed locally inside the Sun.
E) neutrinos have zero mass like photons.