According to Piaget, children's cognitive processes:

A) develop only after the second year.
B) develop in an orderly sequence of stages.
C) develop only after the first year.
D) begin from the preoperational stage.

Piaget's theory of cognitive development suggests that children's cognitive processes develop in an orderly sequence of stages, starting from the sensorimotor stage (birth to about 2 years), through the preoperational stage (2 to 7 years), the concrete operational stage (7 to 11 years), and finally to the formal operational stage (from about 12 years onwards). This progression underscores the systematic and sequential nature of cognitive development according to Piaget.