3 Heron and Hummingbird began their ascent from the land, flying high enough to avoid the trees in their path. They coasted over the green canopy of leaves. The heron, realizing that it was going to be a long race, kept a good attitude. After about a half mile, Hummingbird spotted a patch of violets. He dove from his place in the sky with a loud zoom to taste the nectar from the flowers. It was so good that he took a break from the race for a long sweet drink. Heron glanced down at his friend, but kept flying straight ahead like an engine on a railroad track. After a while, Hummingbird struggled to get back into the race, his belly full of nectar. He decided to settle down in a cozy moss nest on the side of a tree for some shuteye.
In paragraph 3, what is implied by the sentence Heron glanced down at his friend, but kept flying straight ahead like an engine on a railroad track?

A) Heron remained alert and determined.
B) Heron had an important schedule to keep.
C) Heron was not sure how get to the mountain.
D) Heron ran out of steam as he finished the race.