Powerful tropical storms that are characterized by wind speeds greater than 120 km/h and storm surges are called

a.
tornadoes.
b.
hurricanes.
c.
thunderstorms.
d.
hailstorms.

I  think the correct answer among the choices presented above is option B. Powerful tropical storms that are characterized by wind speeds greater than 120 km/h and storm surges are called hurricanes. It is also characterized by having a low-pressure center, strong winds and a spiral arrangement of thunderstorms.

Answers
Hurricanes.

Explanation
Hurricane is a tropical cyclone that mostly occurs in the atlantic ocean and in the northern pacific ocean. It resembles a rapid rotating storm characteristic by low pressures. 
So, best answer that suits the question asked is: b. hurricanes.
Powerful tropical storms that are characterized by wind speeds greater than 120 km/h and storm surges are called hurricanes.