What is the most logical next event?

How to change cat food
Pick cat food based on life stage.
The nutritional needs of your cat will change as they grow and age, so you should change their food when they are making a life transition. If your kitten is becoming a cat or your adult cat is becoming a senior, you should choose a food that is appropriate for their new stage of life.

Choose your answer from: (A). Depending on their health and preferences, you may also want to switch between brands of cat food or between dry and wet varieties of food. Mix the old with the new food. (B). If you are considering changing cat food for your senior cat, you should choose a food that is high in protein and low in fiber. High fiber cats have trouble digesting this content and eventually are unable to absorb the nutrients they need. (C). Some brands of cat food are safer for kittens and provide more health benefits than others. Provide enough food for your adult cat. (D). Most senior cats will reach a special age by this stage. When a senior cat is older and in transition, it will need food with special nutrients.
(A).