“He didn’t bat an eye” means the same as

The idiom “he didn’t bat an eye” means to remain calm and show no surprise even in shocking situations making "he didn’t show surprise" correct. Option A is grammatically incorrect B focuses on happiness and D is wrong since C fits. This idiom describes composure under pressure often used in narratives or professional contexts. Understanding such expressions aids in interpreting character reactions in literature or assessing demeanor in real-life scenarios. It enhances nuanced communication especially in storytelling or professional interactions.