Eleven-year-old evan was asked by his math teacher, "if adam is older than bill and bill is older than cathy, who is the oldest? " this question was too abstract for evan, and he was unable to answer. this shows that evan is in which stage of development?

This shows that Evan is in the concrete operational stage of development.

Explanation: in the Piaget's theory of development, the concrete operational stage is the stage when a child is within the age of 7 - 11 in which they develop logical thinking.

The question asked by the maths teacher requires logical reasoning to answer and typically, children in the concrete operational stage have not developed fully logical reasoning.

your answer should be c, it seems to be the only one that makes sense. mark me branliest : )