Answer:
C. To imply they have a magical quality
Explanation:
According to the likes from "Bellbirds", the poet
"The silver-voiced bell-birds, the darlings of day-time,
They sing in September their songs of the May-time.
When shadows wax strong and the thunder-bolts hurtle,
They hide with their fear in the leaves of the myrtle;
When rain and the sunbeams shine mingled together
They start up like fairies that follow fair weather..."
The poet uses a simile to compare birds to fairies to imply that they have a magical quality.
