This question tests knowledge of relative clause usage. The correct sentence has a relative clause modifying 'The book'. Option B is the correct one, with the relative clause functioning as an essential modifier. Option A has a redundant subject. Option C incorrectly uses that after a comma, that can not be used to introduce non-defining relative clause. Option D incorrectly combines independent and dependent clause structure. **Core Concept:** Relative clause usage. **Solution Strategy:** Identify correct relative clause introduction and structure. **Option Analysis:** * A: Incorrect usage of a comma before relative clause which, and with the redundant pronoun 'it'. * B: Correct usage of the relative clause. * C: Incorrect use of that after comma. * D: Incorrectly combining independent and dependent clause structure with that. **Key Evidence:** The use of 'which' to introduce the relative clause that directly modifies the book. **Common Mistake:** Confusing defining and non-defining relative clauses and their punctuation, and redundancy usage