From the statements below, select those that are true and accurately describe solar neutrinos and the solar neutrino problem. select all that apply. choose one or more: a. only about one third of the expected number of neutrions were detected in early experiments causing astronomers to doubt if their models of nuclear fusion were correct. b. the presence of solar neutrinos prove that nuclear fusion is the energy source that powers the sun. c. several thousand neutrinos generated as a by-product of nuclear fusion in the sun pass through the earth each day. d. the sun is transparent to neutrinos and once they are made in the core of the sun they quickly travel directly through it. e. as neutrinos travel through space, they oscillate among three different kinds (flavors) -- electron, muon and tau neutrinos; only the electron neutrino was visible to early detectors. f. the solar neutrino problem refers to finding many times the number of neutrinos reaching earth as models of nuclear fusion in the sun predicted.