Which of the Following Statements Best Describes the Concept of Consumer

Which of the following statements best describes the concept of consumer surplus?

A) "I sold my DVD copy of Home Alone for US$18 at a garage sale even though I was willing to sell it for US$10."
B) "Carrefour was having a sale on Mars ice cream so I bought 3 packs."
C) "I was ready to pay US$300 for a new leather jacket that I had seen in City Center Mall but I ended up paying only US$180 for the same jacket."
D) "I paid US$130 for a printer last week. This week the same store is selling the same printer for US$110."