Answer: Volcano eruption is correct answer.
Step-by-step explanation:
Volcano eruption occurs when hot materials get thrown out from the interior of earth's surface.
When there is volcanic eruption , it emit so many gases as follows:
Water vapour
Carbon dioxide
Sulfur dioxide
Some elements are two produced by volcano are :
Sulfur
Bromine
Boron
Chlorine
which get into oceans.
Hence, volcano eruption is correct answer.