Which of These Statements Seems to Be the Correct Explanation

Multiple Choice

Which of these statements seems to be the correct explanation for the low neutrino rates detected by Davis and others?

A) The neutrinos change their nature en route from the Sun to Earth.
B) The core of the Sun is actually about 10% cooler than had been originally predicted.
C) The Davis result was subject to much uncertainty because it measured only a small-yield side branch of the main nuclear reaction.
D) The neutrinos Davis detected were coming not from the Sun but instead from sources within Earth.