by decreasing the thickness of soil by causing more heavy rains to erode topsoil by disrupting the sunlight from reaching producers by causing the surface of Earth to be warmer than usual
I gave my students this multiple choice question: In the geologic past, abiotic factors such as volcanic eruptions have had an impact on the availability of resources. How can volcanic eruptions impact the availability of resources?

Only one answer is correct among these 4 choices:
- by decreasing the thickness of soil
- by causing more heavy rains to erode topsoil
- by disrupting the sunlight from reaching producers
- by causing the surface of Earth to be warmer than usual

Could you tell me which one is correct?

by disrupting the sunlight from reaching producers