Which of the following condition would decrease the ability of a person to hear a sound?

These are some conditions that can possibly decrease the ability of person to hear a sound:
1. Blockage of the ear canal -  ear wax is naturally produced by our ear canal which serves as self- protection. It also block sounds if the ear canal is not well cleaned. 
2. Foreign bodies in the ear canal - foreign bodies such as beads, left residue of cotton, peas or even small insects like bugs, bees, and spiders. 
3. Infected Eardrum - eardrum catches sound waves that passes through the ear canal. If the eardrum is damage, it may lessen its ability to catch sound effectively.

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.