Most of the world's volcanoes are found in the:

Correct answer: (d) Circum-Pacific belt

Explanation

Most of the world's volcanoes are in the Circum-Pacific belt, the Ring of Fire, a horseshoe-shaped zone round the Pacific Ocean: from the Andes up the west coast of North America, across the Aleutians and the Bering Strait, and down through Japan, the Philippines, Indonesia and New Zealand.

Here oceanic plates sink under other plates (subduction). The belt has about 75% of the world's active volcanoes and about 90% of its earthquakes.