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 stretch to improve your flexibility [title] Warm up your muscles. [step] Perform 40 jumping jacks , 25 squats, run on the spot for 5 minutes, and ten press-ups or ten girl press-ups if you are not strong enough. [title] Start with simple stretches to get used to the concept and feeling of stretching. <sep> (A) [step] You can stretch on a ball or in the sky. Avoid attempting to do anything difficult or hard and figure out what you're doing properly. (B) [step] Does it feel to stretch? That is great. Start slow and do thirty chest presses before you reach bench pressing. (C) [step] Stretching is the single best way to exercise comfortably and to elevate your blood circulation. [title] Work your muscles with the backbend workouts. (D) [step] Stand up and stretch your legs into a wide straddle. Reach down until your palms rest on the ground, keeping your legs straight.
Example Output: D

Example Input: A person is riding a bike over a trail. they <sep> (A) go over several jumps on the trail. (B) set up a camera in the middle of the trail. (C) are going down the road on a dirt trail. (D) go through a tunnel on the side.
Example Output: A

Example Input: [header] How to deal with rats [title] Set out poison rat baits. [step] If you have an infrequent rat problem, or would rather not have to check traps on a daily (or weekly) basis, invest in poison rat bait. Simply set a small chunk of the poison bait in areas where you've seen rats, including the attic or basement of your home. <sep> (A) Avoid releasing it further back into the rat's home. See warnings below for making sure to have the bait out before, during and after feeding. (B) Hold the rat securely up above your head, then turn on the floor lights or shut the window blinds. Drop a small pouch over your shoulder, and you have an easy kill for rats. (C) This will prevent rats from seeing the bait. You can also put the bait out during other times, like when you see rats on their way out of the house or when you're out at lunch. (D) The poison is designed to smell appealing to rats, who will die once they've ingested the bait. [substeps] You can buy a bucket of poison rat baits at a local hardware store for about $25 usd.
Example Output:
D