Answer and explanation

Correct answer: B. This book is more interesting than that one.

  1. Step 1: Long adjectives use "more" plus the adjective and "than" for comparison.
  2. Step 2: The first sentence follows that pattern.
Answer
This book is more interesting than that one.
Why not the others: "Interestinger" is not a word, "most" is a superlative, and "that" cannot replace "than".

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