The randomly selected delivery times, in minutes, of two restaurants are as follows. Which restaurant has more consistent delivery times?
Restaurant 1 Restaurant 2
40 42
37 38
40 37
41 39
38 38
46 40
41 42
37 41
40 40
a Restaurant 2 is more consistent, because the range of its delivery times is lower than that of Restaurant 1.
b The delivery times of both restaurants are equally consistent.
c Restaurant 2 is more consistent, because the range of its delivery times is higher than that of Restaurant 1.
d Restaurant 1 is more consistent, because the range of its delivery times is lower than that of Restaurant 2.