Fill in the blank with the most appropriate idiom:
After months of subtle manipulation, she finally showed her true colors and ______.
Show answer & explanation
Correct answer: B
Explanation
The phrase 'showed her true colors' means to reveal one's true nature or character, especially a negative one, after a period of concealment. The context of 'subtle manipulation' suggests a negative action is needed to complete the sentence. The idiom 'stabbed him in the back' means to betray someone. This fits the negative context and the idea of a hidden, harmful action.