The country among the choices which has about 20 active volcanoes is the Philippines. The PHIVOLCS which is the Philippine national institution dedicated to studies on volcanoes have identified at least 23 volcanoes as active with 21 of them having historical eruptions.
It is because the Americans started to see all the other countries become free and they wanted to become free to. They also started to not like the way the British treated them.
They form when wind blows over the surface of the ocean. Wind energy is transferred to the sea surface. Then, the energy is carried through the water by the waves. This gives waves the energy to erode the shore.