Where in the laboratory is long, unrestrained hair most likely to be a safety concern?
near an open flame
close to a fume hood
next to a concentrated sodium chloride solution
by a cabinet that contains flammable liquids

Option (a) is the correct answer.

Explanation:

When we work in a laboratory then it is necessary to take the required safety measure to keep the safety of our own self and others.

So, when we work with long, unrestrained hair in a laboratory then we should be more cautious when we go near an open flame. This is because open hairs are more likely to catch fire easily.

Hence, we can conclude that near an open flame in the laboratory long, unrestrained hair are most likely to be a safety concern.