Final answer:
The correct answer is B) A distracting setting, as the metaphor 'baby' represents the task that requires focus and should not be exposed to environments that could prevent its successful completion.
Step-by-step explanation:
The expression 'do not put the baby in' suggests that when you have a hard task that requires a great deal of focus, you should avoid placing it in circumstances that would be detrimental to its success. Hence the correct answer to the question, If you have a hard task to achieve which takes a lot of focus, thus this is your baby, do not put the baby in, would be B) A distracting setting. Keeping in line with the metaphor, the 'baby' represents the task, and to ensure its well-being, one should not expose it to an environment where concentration would be continuously interrupted, thereby preventing successful completion of the task.