What are the recommended actions in case of poisoning by smoke or gases?

The gases that most frequently cause poisoning are carbon monoxide, butane gas, and natural gas or methane.
If it is the smoke from a fire, the inhaled substances are multiple and also depend on the products that are burning.
The usual symptoms are nausea and vomiting, headache, vision or hearing alterations, cough and hoarseness in case of fire, confusion, weakness, lack of reflexes, difficulty breathing, convulsions, and coma.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I, II, and III are correct.