Rank These Fossil Fuels on Their Cleanliness (Cleanest to Dirtiest)

Multiple Choice

Rank these fossil fuels on their cleanliness (cleanest to dirtiest) . 1. coal 2. petroleum 3. natural gas

A) 3, 2, 1
B) 2, 3, 1
C) 1, 3, 2
D) 1, 2, 3
E) 3, 1, 2