The C : N ratio in humus is

Answer: Option A

Humus is the dark organic matter in soil that is formed by the decomposition of plant and animal matter. It is a soil organic matter rich in nutrients and retains moisture in the soil.
The carbon and nitrogen ratio of humus is about 10 : 1. The carbon to nitrogen ratio is significant in composting because microorganisms need a good balance of carbon and nitrogen to remain active.