Personally, I encourage people to do extreme sports because it is citizens’ elementary right to opt for their favorite sports. Attempts should be made to ensure these dangerous sports are thrilling and amusing; however, to prevent accidents and injuries is highly recommended. In this paragraph, “encourage” and “recommended” represent the application of two methods of conclusion. One is    and the other is    .
A、a recommendation, a summary and final thought
B、a summary and final thought, quotation
C、 a summary and final thought, a recommendation
D、a summary and final thought, quotation