Which of the Following Transactions Takes Place in the Markets

Which of the following transactions takes place in the markets for the factors of production in the circular-flow diagram?

A) Dylan receives a salary for his work as a financial analyst for an investment firm.
B) Kristin buys two business suits to wear to her job as a Chief Information Officer.
C) Jim receives clean water in his home in exchange for paying his water bill.
D) Caroline owns a nail salon and receives payments from her clients for her services.