The idiom "keeps his cards close to the chest" means to keep one's plans, thoughts, or intentions secret and not reveal them to others.
Step 1: Understanding the idiom
This phrase originates from card games where holding cards close to the chest prevents opponents from seeing them.
Step 2: Analyze the options
- Option (A) accurately describes the meaning of the idiom.
- Option (B) literally refers to playing cards but does not capture the figurative meaning.
- Option (C) is opposite to the idiom’s meaning.
- Option (D) relates to emotions, which is unrelated here.
Therefore, option (A) is the correct interpretation of the idiom.