Which of the Following Is True of a Competitive Industry's

Which of the following is true of a competitive industry's labor demand curve?

A) The industry labor demand curve is a horizontal summation of the individual firm's demand curves for labor.
B) The industry labor demand curve is less elastic than the individual firm's demand curves for labor.
C) The industry labor demand curve is a vertical summation of the individual firm's demand curves for labor.
D) The industry demand curve shows that at a lower price,less of the input is employed in the industry.