As the O3 suggests, the Ozone molecule is made up of 3 Oxygen atoms.
The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse faster and travel a greater length of the tube. Consequently, the white ring of ammonium chloride will form much closer to hydrochloric acid end of the tube. Which in conclusion your answer will be D :)
It depends on the pH level of the water.
I think it's Salt water I hope that helps