(C) It adds joy and wonder.
The rainbow is usually a symbol of joy and in this poem, God is said to have produced the rainbow with a simple smile. God then wraps the rainbow around his shoulder which relays an image of wonder.
<em>For every atom blonging to me as good as belongs to you-that simultaneously asserts the poet's absolute individuality and the dissolution of such individuality around him.</em>
The plural of chief is chiefs