Fifteen-year-old Donny can read his math textbooks quickly. His little sister, Marie, also reads her math books, but it takes her longer and she stumbles over some words. Donny is demonstrating greater a. abstract thinking. b. metacognition. c. hypothetical deduction. d. automaticity.

d. automaticity.

Explanation:

Automaticity: The term automaticity is defined as an individual's capability to do various things in the absence of occupying his or her mind with the required details of two-level that allows it to display an automatic response habit or pattern. Automaticity is considered as the result or consequence of repetition, learning, and practice.

In the question above, Donny is demonstrating greater automaticity.