Answer :
It's C: theme and mood are usually closed. If there, for instance is the 'spring joy', the mood will be one of merriment.
In poems, thoughts and emotions are so closely connected that theme and mood are closely linked. Option C is correct.
The thought express the theme and emotions express the mood. They are closely connected in a poem.
The mood in a poem can be described through certain words uncluding: romantic, realistic, optimistic, pessimistic, gloomy, mournful, sorrowful, and the like.