Discerning is the answer to your question.
Ok when we inhale we are letting oxygen inside of us, that oxygen that we inhale helps our blood move around our bodies. When we breath out taking out all the old air thats called carbon dioxide and it is very dangerous because it can make us stop breathing if we dont find new oxygen fast. Please if you need more info just private message me.
B) more hazardous because your range or visibility is limited by your headlights
B or d ! Are the best ones
