1. The problem asks: For which situation would you use a continuous line graph? 2. A continuous line graph is used to represent data that changes smoothly over time or another continuous variable. 3. Let's analyze each option: - A: Temperature over the course of a day — Temperature changes continuously and smoothly over time, so a continuous line graph is appropriate. - B: Value of the coins in people's pockets — This is discrete data (count of coins), not continuous. - C: Number of cars sold during each month of a year — This is discrete data measured monthly, better represented by bar graphs. - D: Number of downloads of a particular song during a year — Also discrete counts over time, better with bar or point graphs. 4. Therefore, the correct answer is A. Final answer: **A**