To solve this question, we need to determine the most contextually correct word to complete the sentence: "Before we went hiking, we spent many hours _____ over the maps."
The correct completion of the sentence is:
Before we went hiking, we spent many hours poring over the maps.
In this sentence, "poring" is the appropriate word that describes the action of closely examining the maps before hiking. The other options do not make logical sense in this context.