what should I pick ?

Joe measured a brick using a ruler with centimeters and got 9 cm. He then measured the same brick using a ruler with millimeters and got 90 mm. Are these measurements equivalent? Why or why not?

A. Yes, because 10 cm is the same as 1 mm.
B. Yes, because 1 cm is the same as 10 mm.
C. No, because 2 cm is not the same as 20 mm.
D. No, because 1 cm is not the same as 1 mm.