Which of the following could not bar entry into an industry?

Which barrier to entry is an exclusive right granted to the author or composer of a literary, musical, dramatic or artistic work?

A) patent B) copyright C) public franchise D) government license E) natural barrier

The calculation of the responsiveness of suppliers to changing prices is represented by

a. cross elasticity b. supply elasticity c. the supply coefficient d. long-run supply e. market-day supply