Final answer:
The riddle asks for the fourth child's name, with the answer being provided by the question itself: d) Your. This is because the riddle refers to 'Your mother,' indicating that the person being addressed is the fourth child.
Step-by-step explanation:
The question presented is a play on words and is meant to be a riddle rather than a fact-based academic question. As such, it doesn't cleanly fit into traditional academic categories such as Mathematics or English. The answer to the riddle, however, is provided by the wording of the question itself. When the question refers to "Your mother," it implies that the person addressed in the question, which is "you" in this case, is the fourth child.
Therefore, the correct answer to the riddle is: d) Your.
So, if the question were reframed to fit into an academic category, it would belong in an English or critical thinking category as it deals with understanding language and context. However, since this is a riddle, it falls outside of traditional school subjects and is not assigned to a specific grade level. Riddles like this one can be used as brain teasers to promote logical and lateral thinking.