Angelica and Her Younger Brother Houston Are Both Given Three

Angelica and her younger brother Houston are both given three fountain pens, each containing clear ink, and are informed that some combination of ink will yield a color. Because Angelica is a formal operational thinker and Houston is a concrete operational thinker, how will their behavior likely differ?

A) Angelica will spend more time thinking about the task and be more systematic when attempting to solve it.
B) Angelica will use a piece of paper to draw out the problem.
C) Houston will only use two of the pens.
D) Houston will watch how Angelica solves the problem and then repeat her steps.