Sydney, when faced with a problem, starts with a hypothesis, deduces testable inferences, and isolates and combines variables to see which inferences are confirmed. Sydney is in Piaget’s stage of development
A) sensorimotor
B) preoperational
C) concrete operational
D) formal operational

D) formal operational.

Explanation:

Starting at the age of around 12, the formal operational stage is the last stage of Jeans Piaget's four cognitive development stages. When adolescents reach this stage, they develop the ability to think abstractly by manipulating ideas, think creatively, use abstract reasoning and visualize the consequences of specific actions.

is this even a question? ? : /

answer; group behavior;