Question

error or no error
Watching the familiar story unfold on the screen, he was glad (that he read the book with such painstaking attention to detail)
a. that he read the book with such painstaking attention to detail
b. that he had read the book with such painstaking attention to details.
c. that he read the book with such attention to particulars
d. that he read the book with such intense effort
e. that he paid so much attention to the plot of the book