The alveoli are surrounded by tiny blood vessels, called capillaries carrying blood to and from the heart.
~ B - Adding wood to a burning fire to increase the heat.
A is kind of like a reaction to negative feedback - it's too hot, so cooling down.
C is like turning the air conditioner off. It's cool enough.
B on the other hand adds something to the whole by reinforcing it. The fire is a metaphor for the writer's self-esteem, ego, good-feelingness, what-have-you.
What chart-
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Answer: Viruses are non living organisms.
Explanation: