In a video game, when the player must clear an obstacle in order to enter a level, a mythologist would call this?
a. defeating the guardian.
b. the heroic quest.
c. the initiation.
d. the hero's reluctance.

Let's break this down.

Video game: The setting of this scene
Player: The character controlled 
clear an obstacle in order to enter a level: Pre-level "quest" 

Now let's examine answer choices:
A. defeating the guardian -- too grand; belongs in the level
B. the heroic quest -- too grand; belongs in the level
c. the initiation -- definition: the action of beginning something, so this is possible
d. the hero's reluctance -- the hero isn't reluctant to begin the level; belongs somewhere else(most likely not in the level)

The only possible answer choice would be:
Answer Choice C