Answer:
A) No. One kitten is not an appropriate sample size
Step-by-step explanation:
She is making a mistake of generalizing the results of one single situation to the results of all the food that her cat can eat, and then to the whole species, if she wants to determine if all cats prefer tuna, she should use a sizeable source and test it on several cats in order for it to be scientifically correct and to be able to say "Cats prefer tuna over dry food".