The answer is: C) joyless to hopeful
Mood refers to the feelings and emotions the author causes in the readers.
In the passage from Thomas Hardy's "The Darkling Thrush," the speaker feels gloomy after at the desolate wintertime sight at the end of the year. As he is miserable contemplating the cold and icy landscape on a gate near the woods, he suddenly hears the voice of a fragile bird called thrush. Finally, he is amazed that there is joy in this landscape, an he is contented that there is a reason to exist and be happy.