See red

Do you know the English idioms “to see red“? Look at the conversation below. Can you guess the meaning?

Lloyd: How did the boss react when you told her about the mistake?

June: She saw red. She said she was really close to firing me!

Does it mean:

a) become very angry

b) become very confused

c) become energized

d) become unhappy

The answer is below! ↓

Answer: a) become very angry