Answer:
The correct answer here would be option D) more of textbooks would be consumed and less of coffee would be consumed.
Step-by-step explanation:
In economics, substitution effect refers to a situation where there is change in demand of one good in response to the change in price of other goods. Same situation is taking place here as now the price of textbooks have decreased , Ariana will now look to consume more of textbooks and less of coffee.