Mr. Johnson i am very sad to inform you but were going to have to let you go. you are bad at your job and you costing this company millions of dollars.
sincerely the board members
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A seems to be the best answer.
By Dickinson's time, horses were likely not transportable (stables are structures built on ground and not movable). They also knew a bit more about astronomy by that time I believe and nothing suggests racing in the poem