A student measures the distance a toy car travels as a function of time. The following data is collected:
Time (s): 1, 2, 3, 4, 5
Distance (m): 2, 4, 6, 8, 10

Based on the data, what can be concluded about the relationship between distance and time?
a. Distance is inversely proportional to time.
b. Distance is directly proportional to time.
c. Distance and time are unrelated.
d. Distance and time have a nonlinear relationship.