A、salesperson works 50 weeks each year and makes an average (arithmetic mean) of 100 sales per week. If each sale is worth an average (arithmetic mean) of $1,000, then what is the total value of sales made by the salesperson in a year
A．$50,000
B．$100,000
C．$500,000
D．$1,000,000
E．$5,000,000