If the graph shows a distance vs. time relationship, an increasing graph for an animal indicates that it is consistently moving forward without any pauses or setbacks.
In the context of a race, if only one animal exhibits an increasing line throughout the entire duration of the race, that would be the animal showing continuous progress without stopping or going backward.
Please refer to the graph for confirmation on which specific animal has an increasing line for the entire race duration. If one animal consistently moves forward the whole time without any flat or decreasing sections on the graph, that animal would be the correct answer. If all animals have sections where the distance does not increase, then the answer would be none of them.
If you have specific details from the graph, I can help you analyze that data further!