Which of the following is an example of a biomass energy source?

a$.)$

A boat raises a sail and moves smoothly across the lake.

b$.)$

A camper builds a cooking fire using sticks and dry moss.

c$.)$

Lamps on an outside deck absorb light during the day and light the deck at night.

d$.)$

Ancient Romans built waterwheels to grind grain to make bread.