Köppen’s climate classification system is based mainly in which two factors?
a. wind speed and wind direction
b. mountains and valleys
c. temperature and precipitation
d. ocean and lakes

C. Temperature and Precipitation

Explanation:

The Koppen Climate Classification system is based largely on the factors of temperature and precipitation. A climates are tropical and have year round warm temperatures with varying precipitation. B climates are universally dry but can be cold or hot. C climates are temperature  and can be mild, cool or cold. D climates are continental and are characterized by their extreme conditions. E climates are permanently cold, polar regions and H climates are those found at high altitudes.

the awnser is a

it is not b or c