If we study the yearly reports on accidents that took place in the USA, the common percentage that is displayed every year rounds about a thirty percent of the total accidents. However, there is always a slight shift of 0.2 to 2.0 percent for the same, every year. So it is almost clear that 30% of the total accidents (in a year) occur due to alcohol.
Therefore, the blank must be filled with the word that is mentioned in bold and is underlined:
Alcohol use, .... pedestrian, was ..... almost <u>one-third </u>of all ... crashes involving ... fatalities.
In my opinion, this is the best-suited answer without any options provided.
Do you mind elaborating a bit more :)
An adverb modifies a verb like adjective or another verb it answers the questions when where how and to what extent
