Read the story Hummingbird and Heron:

Many years ago, when the world was so young that the sun was still new in the sky, there lived two friends. Heron was large and slow, with a long, gangly neck and big, floppy wings. Hummingbird was tiny and swift, with wings that moved so quickly that they buzzed and a slender beak as sleek as a needle.

Heron and Hummingbird both loved to eat fish from the river. Every morning, Heron would fish to her heart's content, eating until her stomach was so round and heavy that she had to waddle back to shore. Every afternoon, Hummingbird would fish and feast until he was so heavy that his tiny, buzzing wings could no longer keep him in the air. Heron and Hummingbird thought they were the luckiest birds in the world.

One afternoon, Hummingbird did not catch as many fish as usual. He fished and he fished, but his line came up empty more times than it ever had before. He flew to Heron's house.

"Heron! Heron!" he called. "Why have you eaten all the fish?"

Heron bustled to her door, angry and surprised at her friend's accusation.

"Me? Eat all the fish?" she squawked. "I barely caught anything this morning! My poor stomach has been growling all day."

The two birds began to argue over who had eaten more fish. Finally, Hummingbird raised his wing to stop the debate.

"I do not think there are enough fish left in the river for both of us," he said. "Let's have a race. Whoever reaches the dead tree on the other side of the hills first owns all the fish. The loser has to find something else to eat."

Heron agreed. They prepared to race. Hummingbird was certain that he would win. He watched Heron as she awkwardly stretched her wings and prepared to fly. This will be like catching fish in a barrel, he thought with a grin.

Hummingbird zoomed past Heron as soon as the race began. He flew so far ahead that he lost sight of her behind him. He slowed down as he passed a patch of wildflowers. They smelled so sweet that he had to stop and look at them more closely. Hummingbird just had to try some of their nectar. He drank until his belly was heavy and his eyelids drooped. Perhaps just a short nap, he thought, as he settled himself into a nest of soft leaves.

It was late in the day when Hummingbird woke up. He stretched his wings and glanced at the sky. He could just make out the shape of Heron, flying slowly but surely toward the dead tree. She was almost done with the race! Hummingbird zipped into the air and flew as fast as he could, but it was too late. Heron reached the tree first. From that day forward, Heron owned the fish, and Hummingbird lived on nectar.

What is the theme of the story Hummingbird and Heron?

A. A full stomach is not as important as friendship.
B. Don't get distracted by fresh fish when racing.
C. Sharing shows care for others.
D. Slow and steady wins the race.