The Outflow at the Top of a Hurricane Prolongs the Storm's

The outflow at the top of a hurricane prolongs the storm's lifespan because:

A) it provides an outlet for excess moisture that might otherwise "rain out" the storm.
B) it causes winds to converge at the top of the storm.
C) it prevents surface convergence from "filling in" the low-pressure center of the storm.
D) it helps to bring in cold air to strengthen the hurricane's eye.