SAT Question 15d87c0f: Distributions, Center & Spread answer and explanation with Desmos solution

Choice A is correct. It's given that the bar graph shows the distribution of the number of students in each of four extracurricular activities at a high school. The bar representing drama has a height of $40$; therefore, there are $40$ students in drama. The bar representing chess has a height of $30$; therefore, there are $30$ students in chess. Thus, there are $40-30$, or $10$ more students in drama than in chess.