If Wlad wins the rematch then option a
if Fury then option C cause a Joshua fight is easily more marketable, people seem to care about him more and take him more seriously than Fury plus it seems like it's much easier to deal with Joshua's team than Fury's who is known for his fukkery around fights. I would trsut in Joshua first.
How to manage to not being taken 100% serious even after you beat Wlad? Be Tyson Fury.
Option B can wait, unifiers > mandatories. WBC also lets its champions to unify before the mandatory. Unification gives temporary pass from mandatories. And Wilder shouldn't reclaim the belt cause he wasn't stripped.