Magma generated by a hot spot rises through the rigid plates of the lithosphere and produces active volcanoes at the Earth's surface. As oceanic volcanoes move away from the hot spot, they cool and subside, producing older islands, atolls, and seamounts,
As continental volcanoes move away from the hot spot, they cool, subside, and
A)
become extinct
B)
become dormant
produce craters
D)
produce mountain ranges

Actually you were right it was A) become extinct.

Explanation:

Here's why: As continental volcanoes move away from the hot spot, they cool, subside, and become extinct.

The Hawaiian hot spot has been active at least 70 million years, producing a volcanic chain that extends 3,750 miles across the northwest Pacific Ocean.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation: