Answer:
A. It is based on the maximum sustained wind of tropical cyclones.
Step-by-step explanation:
The categorization of tropical cyclones by PAGASA (Philippine Atmospheric, Geophysical and Astronomical Services Administration) is based on the maximum sustained wind speed of the cyclone. The maximum sustained wind refers to the highest average wind speed observed within a cyclone over a specific period, usually measured over one minute.
The categories help to communicate the intensity of the tropical cyclone and its potential impacts. PAGASA, like many other meteorological agencies worldwide, uses a numerical scale or categories to classify tropical cyclones based on their maximum sustained winds. The higher the category, the stronger the cyclone and the more severe its potential impacts, including storm surges, heavy rainfall, and strong winds.