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:
[header] How to study the phenomenon of light as a nonequilbirum state of matter [title] Understand how thermodynamic systems are categorized. [step] Thermodynamic systems in nature are divided into two types. One is systems that are at equilibrium state with the environment and the other is systems that are in a state of nonequilibrium with the surroundings. <sep> (A) On earth, nature has a preference for systems that are at an equilibrium state with the surrounding. This is so due to the principle of minimum energy that every object in the universe aspires to have. (B) For example, gas rising in temperature throughout the day can be divided into microorganisms in the environment. [substeps] For example, gas rising in temperature in the atmosphere can be divided into molecules in the environment. (C) [substeps] Equilibrium is fundamental in thermodynamics. Other systems include stars, planets, and oceans. (D) [title] Learn about the term " rock hydrodynamics ". [step] Rock hydrodynamics refers to the transfer of water to the earth's surface.

Ex Output:
A


Ex Input:
A woman stands behind a bar and talks to the camera. The woman then takes a glass an puts it on the bar. the woman <sep> (A) screws a cocktail shaker onto a lemon wedge and pressing the lemon wedge back and forth. (B) begins making a cocktail. (C) takes a bucket and turns it upside down. (D) then pours liquid into the glass with ice after.

Ex Output:
B


Ex Input:
[header] How to bring gifts with you when traveling [title] Find out your vehicle's weight limits. [step] Many of today's mid-sized sedans, suvs, compact and subcompact models are close to their maximum load capacity when four adults and their luggage are travelling inside. If you plan to travel with numerous or very heavy gifts, find out your vehicle's weight limit before you pack your car. <sep> (A) Information about load capacity can be found in your vehicle's owner's manual. [substeps] It is unsafe to travel in vehicles that are at their maximum weight capacity. (B) [substeps] Acceleration is one of the factors determining how much cargo you'll be transporting. Take into account any equipment you may be able to carry. (C) Buy smaller bags that make it easier to carry them in the car. [substeps] If your car has more than one extra bag, avoid buying a bigger bag. (D) [substeps] For instance, some international sizes will require 12 or more weight in bags including electronic, light, and resistance waders. Similarly, european countries can bring a car with a heavy bag as well.

Ex Output:

A