The statement tells us that only experienced sellers will meet quota: this sets up a relationship where we know that if one did in fact meet their quota, they must have been experienced since only experienced sellers meet quota.
So we know that If mq then es From this we can also see that if one is not experienced then they did not meet the quota.
C however means something different: it tells us that if one did not meet quota, one is not experienced. This is just an illegal reversal of what we had: it's possible for one to be experienced and still miss for other reasons.
