Final answer:
The variable that is continuous is the number of miles someone drives to work.
Step-by-step explanation:
The variable that is continuous is B. Number of miles someone drives to work.
A continuous variable is one that can take on any value within a certain range. In this case, the number of miles someone drives to work can have any decimal value, not just whole numbers. For example, someone can drive 3.5 miles, 7.2 miles, or any other decimal value.
In contrast, the variables in options A, C, and D are discrete variables. The number of cars in a parking lot, the number of students in a class who are left-handed, and the number of marbles in a jar can only take on whole number values.