What is the best way to: What is the safest way to enter a shower to get clean?

Available options:
(A). Carefully enter your shower once the temperature is steaming hot, if you jump in to quickly you risk slipping and falling, so step in slowly.
(B). Carefully enter your shower once the temperature is perfect, if you jump in to quickly you risk slipping and falling, so step in slowly.
Answer:
(B).