Questions 168~171 refer to the following advertisement.
 Attention all thrill-seekers and adventure enthusiasts! Get ready for the grandopening of our brand new indoor rock climbing facility! Join us for a half-day event onJuly 9th in the morning and experience the excitement of indoor rock climbing. 
As part of our grand opening celebration, we are offering huge discounts for monthlyand annual memberships to those who sign up on the spot. Plus, everyone gets toenjoy a FREE trial session with our expert coaches who will provide one-on-oneguidance throughout the entire experience. 
At our facility, safety is our top priority. Rest assured that our coaches are trainedprofessionals who will ensure that you have a safe and enjoyable experience.Whether you are a seasoned climber or a beginner, our coaches will guide you everystep of the way.
Don't miss out on this once-in-a-lifetime opportunity! Join us on July 9th for a thrillingadventure that you'll never forget. See you at the top.
【題組】168. According to the ad, what is the benefit of signing up for an annual membership during the grand opening event?
(A) A free trial session with expert coaches.
(B) Huge discounts for daily memberships.
(C) Complimentary refreshments for all guests.
(D) A free t-shirt for every participant.