I’m going to take a different approach and say answer c: 8 weeks base, 4 week build, 4 weeks specialty.
Here is my logic:
Since you are coming off an injury, then the base will be a good way to get you back into the groove and start building fitness. I’m not sure what you have planned for the swim and run but I would focus on building volume rather than intensity in those two disciplines too. It all depends on your schedule and your fitness before the injury but I could see 3-4 swims a week with a form, speed, and 2 endurance focus split. Running would be 2 easy short runs, 2 medium runs (hills and tempo) , one long run (extended long, build pace, negative split)
8 weeks should be enough to stop seeing a stimulus response so switching to 4 weeks build would help change things up and raise your proverbial threshold ceiling. In the swim, it depends on how your form is and where your limitations are but if your form is good then I would swap in longer speed sets for the form focus day and keep the endurance day. On the run, alternate hills with traditional speed work and longer hills sets and extend the tempo.
Then finally it’s improtant to get race specific which is why I did not select “a” as an option. 4 weeks of HIM specific workouts should be plenty while keeping your Vo2 gains since those disappear completely in 6 weeks typically. The swim and run need to become more specific during this time too. Practice visualization, pacing, transitions, and nutrition during this phase too. You know the drill A one week taper should do you fine but go with what has worked for you in the past keeping in mind that you will not have the accumulated fatigue of past seasons.
I hope that helps but keep in mind that it’s just my two watts . @julianoliver what was your logic behind selecting A?