Q: Male dogs use what in their urine to mark their territory?
Options:
- (A) hydrocarbons
- (B) volatile substances
- (C) kinetic energy
- (D) an area swollen with pus
- (E) Chemical energy
- (F) competing for resources
- (G) add a solute
- (H) Positive charges
Let's think step by step below.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Male dogs use pheromones in urine to mark their territory. Generally, pheromones are volatile substances. Male dogs use volatile substances in urine to mark their territory.
Thus, the answer is (B).