Which arrangement shows 26/4, 6.45, 6 2/5, and 50/8 in order from least to greatest?

A. 50/8, 6 2/5, 26/4, 6.45
B. 6 2/5, 50/8, 6.45, 26/4
C. 50/8, 6 2/5, 6.45, 26/4
D. 26/4, 50/8, 6 2/5, 6.45

20 points.