What natural disaster would pose the most serious threat to building were new york city to be abandoned a) hurricanes b) earthquakes c) floods dtornadoes

C) Floods

Explanation:

Floods are the natural disaster that would pose the most serious threat to buildings in New York City if the city were to be abandoned. This is because of the city's proximity to the Atlantic Ocean. Tidal waves would most likely flood the city of New York at some point. Moreover, with climate change the sea level will most likely continue to rise, affecting cities that are close to the ocean.

answer: do

the 'italicized phrase' is a noun clause that is used as a direct object.