Class X has 5 sections which have 40, 50, 50, 60 and 60 students, respectively. The pass per cent of these sections are 80%, 76 %, 64%, 65% and 70%, respectively. The pass per cent of the entire class X (correct to two decimal places) is:

A

70.38%

B

71.83%

C

72.81%

D

69.73%