What is the most common cause of envy（）

A. reduce U.S. oil imports by one-third by 2015.
B. have 1 million electric vehicles on the road by 2015.
C. pave the way for installation of both home and public chargers nationwide.
D. build electric vehicle charging stations across the country.

A. She thinks that the book is in pretty bad condition.
B. She feels that she can find the book cheaper on the Internet.
C. She says that the textbook is an old copy.
D. She finds that the textbook is a pirate copy.