Question

which of the following phrases expresses depression?
estoy regular
estoy mal
estoy deprimido

Explanation:

The question asks to identify the Spanish phrase that directly expresses depression. "Estoy regular" means "I'm okay/so-so", "Estoy mal" means "I'm feeling bad", and "Estoy deprimido" directly translates to "I'm depressed", which matches the target emotion.

Answer:

Estoy deprimido