The not knowing if he was or he was n't . It was literally killing me ! Fortunately , a friend recommended a book to me that changed my life .
Why is the narrator so grateful to the friend ?
Pick the best answer from the following options:
A. The friend has recommended them for a course .
B. The friend has recommended them for a loan .
C. The friend has recommended them a job .
D. The friend has recommended them a great book .


D