Why was antimatter present in copious amounts in the early universe, but today is very rare?

Why was antimatter present in copious amounts in the early universe, but today is very rare?
a) Antimatter exists only as part of a virtual pair. Virtual pairs were much more numerous in the early universe because its high temperature provided an abundance of energy. At the present universe's lower temperature, virtual pairs, and thus antimatter, are rarer.

b) The high temperatures in the early universe permitted the creation of matter-antimatter pairs of particles. At the lower temperatures in the present universe, the production of matter-antimatter pairs is much less likely. And as soon as a particle of antimatter is created, it is immediately destroyed by annihilating with matter.

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