A(n) _____ Is a Single Firm with _____, Whereas A(n)

A(n) _____ is a single firm with _____, whereas a(n) _____ implies an industry with _____ firm(s) and _____.

A) oligopoly; no barriers to entry; monopoly; many; easy entry and exit
B) monopoly; barriers to entry; monopolistic competition; many; easy entry and exit
C) monopoly; barriers to entry; oligopoly; few; no barriers to entry
D) monopolistic competitor; barriers to entry; monopoly; one; barriers to entry