Which of the Following Statements Is (Are) TRUE

Multiple Choice

Which of the following statements is (are) TRUE?
I. Public goods tend to be underprovided.
II. One person's consumption of a public good diminishes its use to another person.
III. The marginal cost of providing a public good to another consumer is infinite.

A) I and III
B) II and III
C) I
D) I, II, and III