The correct answer is search.
B. combine with iron
D. convey across water
The correct answer is C. To search persistently or diligently; to rummage; to bring to light; to harry, worry, or torment. Also, to hunt, as with ferrets.
Ferret comes from Old French furet, late Latin furonem (robber).
Examples of use:
- The investigator attempted to ferret out the truth.
- She finally ferreted out the facts behind the incident.