(WILL MARK BRAINLIEST & 95pts) Some scientists believe that the chain of underwater mountains beneath the Pacific, which stretches away from Hawaii up to Alaska, may have once included even more mountains. What probably happened to those mountains?
a. They were destroyed by a hot spot
b. They were subducted into the mantle
c. They became part of the mid-ocean ridge
d. They were flattened to become an abyssal plain

c. They became part of the mid-ocean ridge

Explanation:

The mountains can make a ridge...they can't become a plain because they are not on land.The mountains also can't be destroyed by a hot spot. The only 2 possible answers are b and c. I believe c is the best answer. Hope it helps:)

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.