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".

A a white dog without the use of its hind legs is outside with its owner on the porch. they <sep> (A) begin to walk down the driveway as the camera follows them. (B) are in various environments including by the sea, landscapes, and residential thick forests. (C) get inside and begin wandering around. (D) opened it's door and let it out so it could walk around.
A