Câu hỏi:

Question 78 - 80 refer to following paragraph:
Caldera Junior Bicycle Hitch Recall
Northwind Cycle is recalling the Caldera Junior bicycle accessory for repair. If you think you may have an affected Caldera Junior, stop using it immediately! The hitch connecting it to the bicycle can fail, causing the Caldera Junior to become unstable, which may result in injury. The Caldera Junior “tandem bicycle accessory” consists of a frame, wheels, seat, pedals, and handlebars. It attaches to the back of a standard bicycle by a hitch. Bicycle stores and retailers nationwide sold the Caldera Junior from March 2000 through July 2001. Caldera Juniors were also sold under the name “Caldera Mongoose”, with a “Mongoose” logo appearing on the frame. The recalled Caldera Junior has the model number AC 100, AC 200, or AC 300, on the top tube. Also, recalled Caldera Juniors have an aluminum sleeve on the hitch between the bicycle and the Caldera Junior. Caldera Juniors with nylon or plastic sleeves on the hitch are not included in this recall. Contact us or the retailer from whom you purchased your bike to get a new hitch. Northwind Cycle can be reached at 800- 626-2811 between 8 a.m. and 5 p.m. Central Time, Monday through Friday, for a free replacement hitch and instructions.

78. What reason is given for the recall?