Cooing and babbling refer to first speech sounds of the infant. Here, cooing is

Correct option is B

Cooing is the pleasant vowel-like noises made by infants, typically beginning around 2 months old.
This stage is one of the first milestones in an infant's speech and language development. Cooing involves the production of prolonged vowel sounds like "oo" and "ah" and reflects the infant's experimentation with vocal cords, breath, and mouth. It occurs as babies start to become aware of their own voice and begin to explore vocalization. The cooing phase is an essential precursor to babbling and later speech, as it marks the beginning of the infant's ability to express themselves audibly and interact with their environment.