Which of the Following Statements Is True

Multiple Choice

Which of the following statements is true?

A) In general, if a product has few substitutes it will have an elastic demand.
B) The more time that passes the more inelastic the demand for a product becomes.
C) The demand curve for a necessity is more elastic than the demand curve for a luxury.
D) The more narrowly we define a market, the more elastic the demand for a product will be.