the poll, as stevo said, is about the 2 extreme options, thats why they are the only ones to choose from.
The point of it is to decide what people would prefer , a higher league positino at the end of the season or to have a chance of 2 cups.
If we considered all the viable options there would be about 20 different options including: draw league, win FA, lose UEFA; lose league, FA cup replay, but wi UEFA. Now that would be a shitty poll, as I'm sure everyone WANTS to win every game, sometimes its not possible, sometimes it is.