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". 

Example Input: [header] How to avoid water retention [title] Have a healthy diet. [step] Ensuring you have a healthy, balanced diet is a good first step to avoid water retention. Water retention can occur due to imbalances in your diet, deficiencies of some vitamins and minerals, and having too much salt. <sep> (A) One study found that people with excess salt = no water retention. " imbalance " can add up as a reason for water retention and include making it much more difficult to stay hydrated. (B) Excess salt raises your blood pressure, resulting in inaccurate results. Look for foods that are low in salt and low in water. (C) Eating a balanced diet will help to reduce the chances of water retention occurring due to these issues. [title] Eat food that is rich in potassium. (D) [substeps] If you have recently cooked or baked a meal, make an effort to change your recipe one day. This can help your body prevent the retention.
Example Output: C

Example Input: [header] How to make green beans [title] Bring a pot of water to a boil in a saucepan over medium-high heat. [title] Add salt to the water once it begins to boil. [title] Trim the stems of the green beans and place them into the pot of gently boiling water. <sep> (A) [title] Once the water boils, drop 1-inch (2.5 centimeter) stems of 1 1/2 pounds (2.35 grams) of green beans into the boiling water. [title] Wait until the green beans are ready to be processed. (B) [step] You will need one green bean per cup (260 ml) of boiling water. [title] Add the green beans to the pot. (C) [title] Add ground bell pepper, thyme, and basil to the water for the next step. [step] Stir the green beans in with the salt until everything is evenly combined and the bean pieces are tender to the touch. (D) [title] Leave the green beans in the pot for 4 or 5 minutes, until they are cooked but still crisp. [title] Drain the green beans and cover them in ice water to stop the cooking process.
Example Output: D

Example Input: [header] How to find a hidden tracker on a car [title] Grab your flashlight and owner's manual. [step] The cheapest trackers are fairly large magnetic boxes. Not all devices are this obvious, though. <sep> (A) In the event that a device is hidden behind window or car reflective material, look for one with a digital display. Always take your flashlight with you while you're on the streets. (B) You can also just choose the one you want, ideally with low to medium resolution batteries or hdv low resolution batteries, as these are usually included in the settings window. [title] Look for the tracker in the driver's glove compartment of the car. (C) In some cases the only sign is an out of place wire. Unless you're very familiar with your car, keep the manual handy to stop yourself yanking out a vital part. (D) Carry a flashlight along and use it if available, and take a look at it again and again. When you see a box popping up in the car (or outside it), this is a good sign that there is a hidden tracker in the vehicle.
Example Output:
C