Questions 155~157 refer to the following announcement. 
Dear Valued Customers, 
We would like to inform you that our café will be implementing a price increase of10-30% on selected items starting next month. This decision was made after carefulconsideration of various factors, such as rising ingredient costs, Increase in laborcosts, and investing in new equipment and technology. 
Additionally, we regret to inform you that we have decided to discontinue ourvegetarian and vegan menu items for the time being. This decision was made inresponse to supply chain challenges and the limited availability of quality ingredientsrequired to maintain the high standards of our dishes. We apologize for anyinconvenience this may cause and hope to reintroduce these options in the future.
As a token of appreciation for your continued patronage, we are pleased to announceour new loyalty program. Starting this month, customers can enroll in our loyaltyprogram by making a one-time payment of 1,000 before the end of the month. Byparticipating in this program, customers will earn points for every purchase made atour café. These points can be redeemed for exclusive discounts, complimentaryitems, and other exciting rewards.
We thank you for your understanding and support during these challenging timesand look forward to serving you at Big Big Tree Café soon. 
Sincerely,Big 
Big Tree Café
【題組】155. Why did Big Big Tree Café decide to discontinue their vegetarian and vegan menu?
(A)They want to reduce labor costs.
(B)They want to introduce a new loyalty program.
(C) They want to invest in new technology.
(D)They are facing supply chain challenges.