Fill in the blank with the appropriate preposition: They walked ______ the footpath until they came to a small bridge.
A
along
B
in
C
across
D
through
Correct Option:
A
Explanation
Along means following the length or course of something, so "They walked along the footpath" is idiomatic. "Across" means from one side to another, "through" means moving within or inside something, and "in" does not fit this movement expression.
