Suppose Rosa earns $600 per week working as a doctor for the Medical Clinic. She uses $8 to get her car washed at Spotless Car Wash. Spotless Car Wash pays Nick $375 per week to wash cars. Nick uses $100 to purchase medical services from the Medical Clinic. Which of the elements of this scenario represent a flow from a household to a firm? This could be a flow of dollars, inputs, or outputs.

A. The car wash Rosa receives

B. Rosa's labor

C. The $100 Nick spends to purchase medical services from the Medical Clinic

D. The $375 per week Nick earns working for Spotless Car wash