What is an Argument? (Reloaded)

In each of questions 1 to 4, the passage provided is an argument. Your task is to say which of X, Y and Z are reasons and which is the conclusion.

I X The windows in the room are jammed shut. Y the room is likely to become hot and stuffy. Z It is the hottest day of the year.

II X George thought he saw Jim running in the London Marathon. Y George mistook the identity of the man he saw running in the London Marathon. Z Jim was in Canada on the day of the London Marathon.

III X Computers are not capable of creativity comparable with that of humans. Y Human creativity is intuitive and inspirational. Z Computers are incapable of being intuitive and inspirational.

IV X Juan must be glad that his bicycle is an old one. Y All our friends who have bought new bikes have had them stolen within weeks. Z No one ever steals Juan’s bike even when he leaves it unlocked.