'This book can help because all good books help.' This assumes that

AThis is not a good book

BThis is a good book ✓ Correct

CNo good book helps

DSome good books help

Correct answer: (B) This is a good book

Explanation

The argument assumes that this book is a good book.

Its stated reason is that all good books help.

For the conclusion 'this book can help' to follow, this book must fall under 'good books'.

That unstated step, that this is a good book, is the needed assumption.

Only with it does the general rule apply to this particular book.

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