When scientists use the term "ring of fire" to what are they referring?

a. a cyclical process involving fire, lava, and volcanoes
b. a large mountain range in southern california that has several wildfires every year
c. a song by country artist johnny cash
d. the rim of the pacific plate where many earthquakes and volcanoes form

the rim of the Pacific plate where many earthquakes and volcanoes form

answer; i believe that the correct answer to the above question is; (tariff)

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.