Alek went for a walk.
D(t) models the distance Alek walked (in kilometers) after hours.
What does the statement D(0.5) < D(1) - D(0.5) mean?

(A.) The distance Alek walked during the first half hour is shorter than the distance he walked during the following half hour.

(B.) The distance Alek has walked after walking for an hour is greater than the distance he has walked after half an hour.

(C.) The time it took Alek to walk the first half kilometer is shorter than the time it took him to walk the following half kilometer.