Q: Fact 1: Fanning a fire increases the oxygen near the fire. Fact 2: Fire needs oxygen to continue burning. Given the two facts above, what helps a fire continue to burn?

OPT: (i) fanning. (ii) hydrants. (iii) rain. (iv) firefighters. (v) heat. (vi) loose soil. (vii) bamboo. (viii) sweating.
A:
(i)