Which Statement Best Describes the Solar Neutrino Problem

Which statement best describes the solar neutrino problem?

A) Theoretical models predict that neutrinos should be produced in the Sun,but no neutrinos have ever been observed to be coming from the Sun.
B) Solar neutrinos were detected but in fewer numbers than predicted by theoretical models.
C) No one understands how it can be possible for neutrinos to be produced in the Sun.
D) Our current understanding of fusion in the Sun suggests that all neutrinos should be destroyed before they arrive at Earth,yet neutrinos are being detected.
E) The term solar neutrino problem refers to the fact that neutrinos are extremely difficult to detect.