15
In the given figure, if M and N are points on the sides OP and OS respectively of $\triangle OPS$, such that MN $||$ PS, then the length of OP is :

- (a)$6.8$ cm
- (b)$17$ cm
- (c)$15.3$ cm
- (d)$9.6$ cm
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(C) $15.3$ cm