The correct answer is B. I understand you have four kids; how many times have you actually been pregnant?"
Explanation:
In communication, statements or questions for clarification aim at confirming the information understood or re-stating the question to check the information in case the speaker is not sure about the answer to a question. In the case presented, the nurse will need to check if the answer provided by the patient "I have four kids" means she has been four times pregnant as this might not be equivalent.
According to this, the statement or question for clarification should focus on the answer provided and the original question and therefore, the best statement is "I understand you have four kids; how many times have you actually been pregnant?" because this considers the answer of the patient to re-check information also includes the original question which is the one the nurse wants the patient to answer.