In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase.
Smell blood

Option (d) is the correct meaning of the given idiom.
Given Idiom: Smell blood → To sense a weakness in your opponent and act aggressively. Example: The politician smelled blood after his opponent’s mistake and launched an attack. Similar idioms: Strike while the iron is hot, Take advantage of weakness.