Choose the underlined word or phrase (a b c or d) that needs correcting

choose the underlined word or phrase (a b c or d) that needs correcting

1. He is rich however he is not happy.

          A            B                   C      D

2. Our environment has become worse but there are many factors caused by men.

                                  A                            B              C                                      D

3. My most recent electricity bill is enormous or I'm worried about it.

           A                                      B                   C            D

4. The earth is much hotter so people don't know the way to protect it.

                          A                 B                C                                  D

5. I want to stop working and going out.

                 A           B                    C       D