Select the most appropriate option to fill in the blank.
The king often went on a hunting _________ in the nearby forest.

An expedition is a journey undertaken by a group of people with a particular purpose, especially that of exploration, research, or war/hunting. The term "hunting expedition" is a standard, appropriate collocation.
Journey: A general act of traveling from one place to another.

March: A formal, rhythmic walk, typically by military personnel.

Tour: A journey for pleasure in which several places are visited.