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