Critical reasoning — identify implicit assumptions Statement: “This book is prepared so that even a layman can study science in the absence of a teacher.” Assumptions to evaluate: I. A layman wishes to study science without a teacher. II. A teacher may not always be available to teach science. III. A layman generally finds it difficult to learn science on his or her own.

Introduction / Context:
The publisher claims a book enables “even a layman” to learn science without a teacher. Such wording typically signals a self-study design that removes barriers for beginners. We must isolate which hidden assumptions are necessary for this claim to make sense.

Given Data / Assumptions:

• A self-instructional science book is promoted.
• I: Laypersons desire to study science without teachers.
• II: Teachers are not always available, so independent learning materials are valuable.
• III: Laypersons usually find self-learning of science difficult; the book is engineered to overcome that difficulty.

Concept / Approach:
Use the negation test and minimal-necessity principle. The statement is about capability and accessibility, not about whether a specific layman already “wishes” to study. It presumes teacher unavailability may occur and that typical lay readers need special scaffolding to learn science effectively.

Step-by-Step Solution:

Verification / Alternative check:
Self-study resources target an audience that might lack access to teachers and may need simplified, structured content—exactly II and III.

Why Other Options Are Wrong:

• Only I and II / Only I and III / All: Each wrongly treats a specific “wish to study” as required.
• None of these: Incorrect because II and III are clearly implied.

Common Pitfalls:
Equating “can study” with “wants to study”; conflating capability statements with desire statements.

Final Answer:
Only II and III are implicit