What one? i don’t see anything
C. Adverbial
The underlined word express where is the boat, so it's an adverbial.
Well it wouldn't be the transcontinental Railroad since that was constructed between 1863 and 1869. It wouldn't be that Europe was involved in World War 2 because that didn't even start until 1939. President McKinley was shot but that was in 1901 and Theodore Roosevelt's term was from 1901 to 1909.
So the correct answer would be C. Economic prosperity followed World War 1
I hope I helped you better understand :)
This is true....and watch out for people who post....certain images