Walk-behind tractor implements is a mixed list of different attachments (tiller, flail mower, sickle bar mower), so format B fits.Walk-Behind Tractor Attachments Checklist: 8 Must-Have ItemsChecking length: that is 61 characters, which is over the limit. A shorter version:Walk-Behind Tractor Attachments: 8 Must-Have ItemsThat is 50 characters.Walk-Behind Tractor Attachments: 8 Must-Have Items