Final answer:
Volume 1 of the I-10 contains 18 chapters, covering a broad spectrum of topics providing a detailed learning experience.
Step-by-step explanation:
Volume 1 of the I-10 has 18 chapters. The reference information provided lists the contents of various chapters, confirming chapters 17 and 18. Therefore, the correct answer is B. 18. This volume includes a range of topics, as evidenced by the chapter key concepts and specific details given for individual chapters, helping students grasp a comprehensive understanding of the subject matter.