Which of the following is created when the ice of a comet starts to melt into gases?

Coma

Dust tail

Nucleus

Plasma tail

Plasma tail is the answer

The correct answer would be the last option. It is a plasma tail that is created when the ice of a comet start to melt into gases. As the comet is near to the sun, it melts containing dust, rock and ice that are in the gas phase. They are being ionized by the photons from the sun.