Directions: Select the option that is the passive form of the given sentence.
This book explores the secret of leading a long and meaningful life.
1
The secret of leading a long and meaningful life was being explored by this book.
2
The secret of leading a long and meaningful life is explored in this book.
3
The secret of leading a long and meaningful life had been explored by this book.
4
The secret of leading a long and meaningful life have been explored by this book.