Choose the best option to fill in the blank with an appropriate preposition:
We climbed up to the road and set _________ on what proved to be a very long march to the forest.
Answer & explanation
Correct answer: option 4
The correct answer is OPTION 4 : off
"Set off" is commonly used to express the beginning of a journey or movement. It implies starting an activity with a sense of departure or initiation. Therefore, "set off" perfectly fits the context of climbing the road and embarking on a long march.