Darla Is an Emergency Room Doctor Who Works 12-Hour Shifts

Darla is an emergency room doctor who works 12-hour shifts five days a week.She is also on-call for a 24-hour period one day a week.She rarely has time to socialize but she lives a comfortable life and enjoys helping people and saving lives.In Canada, which social class would Darla be part of?

A) working class
B) lower-middle class
C) upper-middle class
D) upper class