Which version of the candidate's answer best demonstrates Have Backbone Disagree and Commit with clear scope, individual ownership, and specific metric?

Which version of the candidate's answer best demonstrates Have Backbone Disagree and Commit with clear scope, individual ownership, and specific metric? A) "I was working on the payment system and noticed slow transaction times. I escalated the issue to the platform team. They fixed it and customer complaints decreased." B) "We noticed the delivery delays together and investigated as a team. We found the root cause and deployed a fix. Customer satisfaction improved." C) "I noticed an issue outside my team and decided to fix it myself. I investigated the root cause and deployed a patch. Things improved after the fix." D) "During a routine review of the checkout process, I spotted a 0.3% transaction failure rate outside my team with no open ticket. I traced the race condition, wrote a fix, and coordinated rollout with Platform. The failure rate dropped to zero, protecting $8K/week in revenue."