To overwhelm, cover with water.

• A. ingenious
• B. inundate
• C. irascible
• D. implacable

Answer: (B)

You're being asked to pick a word that means to overwhelm, especially by covering with water. Inundate fits this sense perfectly: it literally means to flood or overwhelm with a large amount of something, such as water or information. The other options don’t match this meaning: ingenious means clever or inventive, irascible describes a quick-to-anger temperament, and implacable means relentless or unforgiving. So inundate is the best choice because it specifically captures the idea of being overwhelmed or flooded.