单选题 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