What Is the Solution to the Solar Neutrino Problem

Multiple Choice

What is the solution to the solar neutrino problem?

A) The Sun is generating energy other than by nuclear fusion.
B) The Sun is generating much less energy than we think it is.
C) We do not know how to detect electron neutrinos.
D) Not all fusion reactions create electron neutrinos.
E) The electron neutrinos created in the Sun change into another type of neutrino that we could not detect with our original equipment.