Its "C" because without oxygen you can't have fire
Step-by-step explanation:

in the like term you can add directly and make it single fraction and in unlike term you have to take LCM of denominator .
Answer:
500
Step-By-Step Explanation:
200/50 = 4
4 * 17 = 68
68 / 2 = 34
34 x 5 = 170
170 / 17 = 10
10 x 50 = 500
Answer:
its A
Step-by-step explanation:
because A is a reasonable explanation