Geologists have suggested that the east coast of the united states faces a serious tsunami threat from a. volcanic flank collapse in the canary islands b. large earthquakes offshore of portugal c. meteor impact in the mediterranean sea d. break up of antarctic ice shelves e. volcanic flank collapse along the white cliffs of dover

The answer is A. Volcanic flank collapse in the Canary Islands.
Geologists have suggested that the east coast of the United States faces a serious tsunami threat from volcanic flank collapse in the Canary Islands. A large volcano called Cumbre Vieja (located on La Palma), could erupt and create a tsunami that may reach the East Coast of the United States.

Coniferous forest ecosystem