I think it’s T lymphocytes?
It says: T lymphocytes attack antigens directly and help control the immune response. They also release chemicals, which control the entire immune system....
Gases released from improperly maintained compost piles are a negative effect associated with the composting process. ... The release of methane and carbon dioxide contributes to the problem of greenhouse gases in the atmosphere. Poorly operated composting facilities also cause unpleasant odors.
Warm water. The higher the temperature or thermal energy, the faster the molecules move.<span />
Your answer would be B. Hope this helped :)<span />