In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

Ex Input:
A small group of people are seen lifting a large object into the back of a van and close ups of them and a building. The people are seen riding around a large gymnasium on roller blades performing various flips and tricks. the boys <sep> (A) continue skating around and interacting with one another and performing impressive tricks. (B) continue riding around a sports stadium and performing tricks. (C) play the drums while riding around on bouncy chairs that run in a tight group. (D) ride around again in the end with more people watching on the side.

Ex Output:
A

Ex Input:
[header] How to do chest exercises in yoga [title] Do the mountain pose to warm up, plus a couple of humming bee breathing exercises. [step] These will get you ready to stretch out your body in the variety of poses you'll use to exercise your chest. Notice your breathing pattern as complete the mountain pose. <sep> (A) Inhale and keep your breathing slow and even throughout the whole warm up period. [substeps] Alternatively, do a crossfit pose to warm up. (B) [substeps] You might try taking an extended pause to " use " your rib cage, start to breath in, breathe out, and repeat. You can also try practicing your opening pose from a hovering yoga chair, at home, or in a pose at your workplace. (C) Settle on a consistent, slow pattern of breath as you start the workout. This breathing pattern will help calm yourself and prepare your heart rate for the more difficult exercises to come. (D) [substeps] After doing the mountain pose, you can do finger circles or kangaroo standing pose to warm up the muscles in your chest. [title] Do the rock dii to strengthen the core.

Ex Output:
C

Ex Input:
[header] How to train to become an ambulance attendant [title] Meet the education requirements. [step] Most employers expect ambulance attendants to have a minimum of a high school diploma or ged. Most emt training programs also require a high school diploma or ged as a prerequisite to entering the program. <sep> (A) [substeps] This type of education should be done in high school. Many employers opt for a high school degree as a prerequisite for all emt training programs. (B) Even if you already have a degree in emergency care, you must also be an operator. Check with your country's department of emergency medical information to determine what qualifying qualifications you'll need to meet the necessary level of education. (C) However, some employers may expect a higher level of education and/or training. Many employers also require a certificate in a relevant field. (D) [substeps] Hold a bachelor's degree in a related field such as cardiology or cpr. Have at least 17 years of dental or medical experience in cpr.

Ex Output:
C