Question

based on what you have read, landforms are
a things made by humans.
b plants and animals.
c different types of weather.
d things formed by the earth.

Explanation:

Landforms are natural features of the Earth's surface, such as mountains, valleys, plains, etc., formed by geological processes. They are not made by humans, nor are they plants/animals or types of weather.

Answer:

D. things formed by the earth