Every morning on the farm, the rooster crowed at the break of dawn. Then one day, the barn animals grew weary of his crowing. "We have decided to wake ourselves up every morning," said the cow to the rooster. "Your services are no longer needed."
The cow remembered that the pony had been having trouble sleeping and was usually the first animal awake. "Pony, give a loud yell tomorrow as soon as you notice the sunlight creeping through the cracks of the barn door."
The next morning, the rooster kept silent as the sun rose in the distance. Not a sound could be heard anywhere on the farm, including the barn. In fact, the barn animals were still sleeping when the farmer entered to begin his day of work.
"Why didn't you wake us up?" the cow angrily asked the pony.

Which of the following responses would make the pony's answer a pun?
A.
"I forgot about it."
B.
"I didn't know how."
C.
"I slept too late."
D.
"I'm a little hoarse."