Sweet and low, sweet and low,
wind of the western sea,
low, low, breathe and blow,
wind of the western sea!
5over the rolling waters go,
come from the dropping moon and blow,
blow him again to me;
while my little one, while my pretty one sleeps.

sleep and rest, sleep and rest,
father will come to thee soon;
10rest, rest, on mother's breast,
father will come to thee soon;
father will come to his babe in the nest,
silver sails all out of the west
under the silver moon:
sleep, my little one, sleep, my pretty one, sleep.

why does the poet repeat the phrases "sweet and low" and "sleep and rest"?
a) to rush the crying baby off to sleep
b) to show how long the tired child has slept
c) to create a rhythm that seems calm and peaceful
d) to create a rhythm that seems happy and excited