On Monday, Mr. Lieberenz ran 2.1 miles in 36 minutes. On Tuesday, he ran 5.1 miles in 22 minutes. His rates on Monday and Tuesday ____ proportional because the unit rates for the two days are ____
a. are, the same
b. are, different
c. are not the same
d. are not, different
e. are not, not related
o
f.
are, not related