Why Does the Proton-Proton Chain Need High Temperatures

Multiple Choice

Why does the proton-proton chain need high temperatures?

A) High temperatures increase the ground state energy of the hydrogen atom.
B) High temperatures increase the velocity of the protons so they can overcome the Coulomb barrier.
C) High temperatures lower the density of the gas.
D) High temperatures allow the neutrinos to carry more energy away than the reaction produces.