Explanation:

- The hunter dogs followed the hyena’s ________. The correct word is something that fits with tracking or following trails.

- Option 1: sense - Sense refers to perception through sight, smell, hearing, etc. It's not specific to smells alone.

- Option 2: scent - Scent is specifically about the smell, often associated with the trail or odor an animal leaves. This fits perfectly in the context of dogs following a track.

- Option 3: cense - Cense means to perfume with incense, not relevant to tracking.

- Option 4: cents - Cents are a unit of currency and not related to tracking a smell.