Before you can find what's left you have to ensure that both values you are working on are in the same unit. In this question you are working with hours and minutes and as such you need to ensure that you either convert the hours into minutes, or minutes into hours. Let's change the hours into minutes.
Since the movie in 97 mins and he watched 52 mins of it. The time left is
Pretty sure it’s G cause everyone does math problems at a different pace. And also some math problems are more work compared to others ig. so G would have the most variability for the data