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 girl is riding on a yellow riding lawn mower on a very large yard filled with green grass. when the girl <sep> (A) makes it to the end of the lawn, she stops, takes a deep breath, gets off her horse and walks away. (B) stops, she is standing in front of an able to reach yellow dirt path to prepare her destination. (C) reaches the end of the yard she makes a turn and drives up in the same direction she just came from. (D) reach the end of the yard, she looked around and started to turn around and walk back to the beginning.

Ex Output:
C


Ex Input:
[header] How to ride the toronto subway [title] Use the ttc trip planner. [step] The toronto transit commission (ttc) offers a helpful trip planner on its website. Simply enter your starting point and destination into the appropriate fields, then set your departure or arrival time. <sep> (A) [substeps] To make the trip more convenient, you may enter new york city during the day. For a more convenient route, you can install a new york subway monitoring app on your phone or tablet. (B) [substeps] Search for your nearest ttc station and check for the train you'll be scheduled to take. If your train is local or you're traveling by car, check the transportation schedules and online signs to find one. (C) [substeps] Due to the poor travel times and tourist costs, ttc trips often take 30 minutes or less on weekdays and 45 minutes once throughout the week. Ttc only prolongs this travel time in the 21st century. (D) The planner will let you know which train to take and when to catch one that fits your schedule. [substeps] You can find the trip planner here: http: // ttc.ca/trip _ planner/index.

Ex Output:
D


Ex Input:
[header] How to replace a master cylinder [title] Locate the various components of the vehicle's brake system. [substeps] Use your vehicle's manual to identify these components. Locate the brake fluid reservoir, the brake master cylinder, the brake fluid level sensor, and the brake fluid lines. <sep> (A) Using either 1 (e.g., grease or brake oil) or 2 (e.g., vehicle dioxide) lines, you can fix the brake fluid problem. [title] Remove the brake fluid and brake fluid lines with the asbestos removal tool. (B) The brake fluid reservoir is usually at the top of the brake system and contains brake fluid. It can be identified by the presence of a threaded cap on top of it. (C) Make sure everything fits snugly inside the vehicle. You may need to look in the glove compartment to find the tire pump or fill line. (D) Make sure to get both the brake fluid reservoir and brake fluid line properly. This will prevent the brake fluid from weakening the pipe and leaking out.

Ex Output:

B