Hiding possible alternatives is a way of tricking or forcing people to accept your choice.
For example:
Which is it to be? Holiday in Swansea or no holiday?
What about holiday in Torremolinos?
Not possible, I have no passport. The only alternatives are holiday in Swansea or no holiday.
But you could get a passport.
No I couldn't, I have no photo. The only alternatives are holiday in Swansea or no holiday.
But you could get a photo
Not possible, there is no photo booth in this town. The only alternatives are Swansea, or no holiday.