Choose the most appropriate option to fill in the blank:We helped an…

The correct answer is Option (2) → through

Complete sentence: We helped an injured ranger while passing through the restricted area of the mountains. The speakers were crossing the restricted area of the mountains, so they were "passing through" it.

Option	Used to show	Example
(1) from	the starting point of movement. “Passing from the area” would mean leaving it, not crossing it.	She walked from the station to the school.
(2) through (answer)	Through shows movement in at one side of an area and out at the other, passing inside it.	The train passes through a long tunnel.
(3) between	the space separating two things or people. An area is not two points.	The shop is between the bank and the post office.
(4) among	in the middle of a group of several separate things or people. It is not used for crossing a region.	He found a rare book among the old papers.