Answer:
Four contributory factors that need to be considered while conducting an impact study is to assess the area of operation, what was the impact of initial impact study, research and analysis to done in a deliberate manner, outcome that can be obtain from the particular procedure of the impact study.
Explanation:
A transitional modifier would not necessarily require a comma of any kind if it is at the very end of a sentence, although this is very much up to the will of the author.
The answer is A) Before overland traveling was comfortable or safe
