Final answer:
The general practices necessary before a CT procedure involve asking open-ended questions, encouraging complete information disclosure, and confirming accuracy through repetition and summarization, which correlates to answers D. 1, 2, and 3.
Step-by-step explanation:
The general practices necessary to obtain a sufficient medical history before a CT procedure include asking open-ended questions, encouraging the patient to provide maximum information, and repeating and summarizing the information to assure accuracy. Therefore, the correct answer to the question, which is "The general practices necessary to obtain a sufficient medical history before a CT procedure include: 1. Asking open-ended questions 2. Encouraging the patient to provide maximum information 3. Repeating and summarizing the information to assure accuracy", is D. 1, 2, and 3.