Answer:
The two primary factors that determine how magma erupts is its viscosity and gas content.
Explanation:
D or c because one of them was agriculture that would be c but they also did the other two known as d but swaying towards c
There are a lot of volcanoes,mostly along the pacific ring of fire,mt Fuji in Japan,for example
https://www.reference.com/science/volcanoes-located-along-convergent-plate-boundaries-902a6027f2e299f1#
the link has got more example,you might want to check it out
hope it helps c:
