In writing, diction is different from mood in what way?

Mood means the word choice in the written piece while diction is the emotional situation that surrounds the reader.

Diction means word choice whereas mood reflects the writer's attitude toward the writing's subject or audience.

Diction is the physical setting of a literary piece whereas mood is the emotional setting.

Diction means the word choice used to help set the mood, which is the emotional situation that surrounds the reader.