About 90% of all stars are in the main sequence including our very own sun. They are the stars that are going through nuclear fusion, turning hydrogen atoms into helium.
The correct answer is C.
The comic tone of the play is solely given by the characters' calm reaction to the the huge fire that is surely to burn down the whole hotel.
If the characters were to react like normal people would -screaming and panicking- the play would lose its whole essense.
