Final answer:
One universal principle of human development is the use of abstract thinking to reach conclusions based on general principles. This is evidenced by cross-cultural studies of language acquisition, where developmental milestones are reached in a similar sequence worldwide.
Step-by-step explanation:
Many aspects of human development appear to be universal. One of these universal principles is B. using abstract thinking to come to conclusions based on general principles. Abstract thinking allows individuals to understand concepts beyond the here and now, which includes generalizing from specific instances to broader concepts, essential for human survival and development. Cross-cultural studies show that children all over the world reach language milestones in a similar sequence, which suggests that the capacity for language acquisition is an intrinsic part of human development. All infants, regardless of culture, coo before they babble, and generally, say their first word around 12 months old. These stages of development seem to follow a universal course across different societies, demonstrating how certain elements of human growth are not solely the result of a particular cultural environment but are embedded within our biology.