What is the process by which the universe became transparent to light, occurring when the universe cooled to the point that electrons and protons could combine to form neutral atoms?
Correct: B
Recombination is the process by which the universe became transparent to light, occurring when the universe cooled to the point that electrons and protons could combine to form neutral atoms. This event occurred approximately 380,000 years after the Big Bang and marked the beginning of the universe as we know it today.