Answer:
"parallel processing"
Explanation:
Parallel processing of information in our brain is designed to work more efficiently on the electrical impulses that reach our brain. Our reactions, sensations, movements all happen simultaneously because our brain is capable of processing information quickly, similar to a highly complex, nonlinear, parallel computer.
I dont know 100% sure but C sounds the best. Humans breathe in oxygen (that plants make) and generate carbon dioxide and then releases it for plants to use.