Chinese Mini-test: Air (Beginner)

Beginner Level 初级 (chūjí) A: The air inside isn’t so good. How about we go outside to prepare for the HSK exam? B: Ok, let’s go. Do you know the Chinese characters for “air” in this dialogue? A. 氧气 (yǎngqì) B. 空气 (kōngqì) C. 气味