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". 

[header] How to exercise to prevent blood clots [title] Get up and move around. [step] Whether you're traveling by train, plane, or automobile, long-distance travel involves a lot of sitting. When you sit, you decrease circulation in your legs-especially if you sit with your legs crossed or with one foot under you. <sep> (A) If you are on a train or coach, the seat underneath you always feels flat, as if you are sitting. While there are good ways to stretch out your legs, there is not a lot a group of people can do. (B) This will help promote blood circulation to your feet. It will also keep you from rubbing your legs in an annoying manner-you can't promote blood flow when you're sitting on one leg. (C) [substeps] You can exercise while you drive or driving, although getting up and down on the exercise train can significantly improve circulation. You can also listen to music while you exercise, which will also help to prevent blood clots. (D) [substeps] If you're on a plane, try to get an aisle seat so you can get up and move around more easily. Ideally, you want to get up and stretch your legs or walk up and down the aisle once every hour or so.
D

There is a black dog and a white dog jumping around the person raking the leaves. The white dog is trying to bite off the rake. both the dogs <sep> (A) are walking on the grass and one of the dogs is falling. (B) are standing back on his hind legs trying to get out of the rake. (C) are playing around the man raking the leaves, trying to bite the rake. (D) do this trying to be very nice.
C

A woman spins a blindfold person holding a stick on front a pinata. Then, the person hits the strong, while the pinata is moving. the person laugh <sep> (A) when tie the pinata and continue dancing and laughing. (B) and the woman approach her. (C) and throw the pinata. (D) and catches a square the object.

B