Thank you for the opportunity to help you with your question!
No this is just a reasoning question. Since there are only three untrained rats then there is no possibility of getting 4 untrained rats since the rats are being placed in a different cage.
The answer is B as you indicated
However if the rats were being PICKED AND RETURNED IN THE SAME CAGE THEN b WOULD ALSO BE POSSIBLE
Thanks for your help, but I was actually trying to figure out how many outcomes are possible for the experiment, as asked in 2. I'm not sure if you saw that part.
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