The passengers were angry ______ the airline staff about the delay.
"Angry with" is used if anger is aimed at someone.
"Angry at" is used if anger is aimed at some situation.
Ref: https://english.stackexchange.com/questions/43671/angry-with-vs-angry-at-vs-angry-on
Correct Answer: C
Answer C
The correct preposition is ‘with’.
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