Which condition of volcanic magma would mostly like cause an explosive, destructive eruption? select one: a. thin magma with low gas levels b. thin magma with a high elevation volcanic mountain c. thick magma with a high level of gases

The answer is the option "c"
The eruptions are caused by an accumulation of gases that press under a volcano.
The molten rock continues to generate upward pressure but can not advanced; this causes that its force increases with the passage of time, since it continues accumulating hot gases trying to come to the surface.
Finally, the surface yields and a volcanic eruption occurs.