Final answer:
To revise sentence 9 using the imperative mood, the correct choice is 'Don't be so cynical', which issues a direct command in line with the characteristics of the imperative. The correct option is b. Don't be so cynical.
Step-by-step explanation:
The best way to revise sentence 9 using the imperative mood is 'Don’t be so cynical'. This option directly tells someone what to do, reflecting the imperative mood's use for commands or requests.
The imperative mood is utilized to issue direct commands, make requests, or offer invitations, with the subject (you) often implied rather than explicitly stated.
The best way to revise sentence 9 using the imperative mood would be option b, which is 'Don't be so cynical.' The imperative mood is used to give a direct command or make a request, and in this case, the speaker is telling their sister not to be cynical. This choice effectively conveys the desired tone and meaning.
The correct option is b. Don't be so cynical.