Concept:The Köppen scheme uses letter symbols to group world climates into broad types.
Explanation:In Köppen’s system,
Af is made of two parts.
The letter
A stands for a tropical climate.
The letter
f means the region is wet throughout the year, with no dry season.
So
Af represents a tropical rainforest climate, which is commonly called equatorial climate.
Such areas receive heavy rainfall every month and remain hot all year.
Therefore,
Af does not mean monsoon, Mediterranean, or desert climate.
It matches the equatorial climate type.
Answer:B. equatorial