Which of the following is not included in the classes of volcanoes classified on the basis of frequency of their eruption?

The correct option is D Composite volcanoes
On ​the basis of frequency of eruption, following are the types of volcano: Extinct-Volcanoes which are no longer in the condition of erruption. Active-The constantly errupting volcanoes. Dormant-Volcanoes which have become inactive from a long time but have a possibility of erruption.

The correct answer is D .