Question: How do you kill flies?
Option 0: Put some vinegar in a cup and mix in a few drops of dish soap. The dish soap will disrupt the surface tension of the vinegar, causing the flies to drown if they try to land on the surface of the liquid.
Option 1: Put some vinegar in a bowl and mix in a few drops of dish soap. The dish soap will disrupt the surface tension of the vinegar, causing the flies to drown if they try to land on the surface of the liquid.
Answer: 1