(C) To find the odd number,we analyze the divisibility of each term in the sequence by $7$.$14 = 7 \times 2$$49 = 7 \times 7$$63 = 7 \times 9$$72 = 7

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(C) To find the odd number,we analyze the divisibility of each term in the sequence by $7$.$14 = 7 \times 2$$49 = 7 \times 7$$63 = 7 \times 9$$72 = 7 \times 10 + 2$ (Not divisible by $7$)$77 = 7 \times 11$$91 = 7 \times 13$Since all numbers except $72$ are multiples of $7$,$72$ is the odd number in the sequence.