Statement: This book is so prepared that even a layman can study science in the absence of a teacher.
Assumptions:
1. A layman wishes to study science without a teacher.
2. A teacher may not always be available to teach science.
3. A layman generally finds it difficult to learn science on its own
Answer: B
Clearly, the statement is made to impress the usefulness of the book. It does not mention the desire of a layman. So, I is not implicit. Also, the book is intended to guide one when a teacher is not available. So, both II and III are implicit.