The following heights are from a PE class of twenty students in inches.
55 56 58 59 59 60 60 61 62 64 66 67 68 69 69 70 72 74 76 78
If Jeff is 66 inches tall, what is his percentile rank in the PE class?
A. 50th
B. 60th
C. 70th
D. 40th