A number -arrangement machine, when given an input string of numbers, arranges them following a particular pattern. The following is the illustration of an input and its arrangement.

As per the rules followed in the above steps, find the appropriate answer
Which is the fifth number from the left end in step III of the following input?
6, 2, 14, 17, 8, 13

A

64

B

72

C

75

D

77