In Pair Production in the Big Bang,which Statement Is FALSE

In pair production in the Big Bang,which statement is FALSE?

A) The heaviest particles and their antiparticles formed first, from collisions of the highest energy gamma rays.
B) Matter is frozen energy, according to Einstein's E = mc².
C) Every electron should have a proton formed at the same time with it.
D) Even neutrons have their antineutrons, although both lack any charge.
E) In addition to familiar neutrons and protons, many other exotic particle and antiparticle pairs formed, but decayed back to radiation.