During which stage of child development do children start using language skills?

The correct answer is B, as infancy is the stage of development where children begin to use language skills. From around six months of age, infants start to make cooing and babbling sounds, which are the foundations for later language development. By the time they reach their first birthday, many infants can say a few simple words and begin to understand basic language concepts. This early use of language is critical as it supports communication and social interaction, laying the groundwork for more complex language skills in later years.

During prenatal development, while there is remarkable growth and development occurring, the fetus is not yet able to use language. In middle childhood, children's language skills become much more advanced, but the initial use of language occurs during infancy. Adolescence involves further development of language skills, but again, it is not the initial stage where these skills first emerge. Thus, infancy is indeed the critical period when children start to genuinely utilize language skills.