Multiple Response Question: no selection possible

Hello back, 

Some of my Multiple Response Question have no response. I mean all of the propositions are false. So the learner has to not click on any propositions. But I can't do that, storyline ask me to make a choice. 

My solution is to add a "none of the above" but this proposition has to stay the last one, in other hand I want the other propositions appears randomly. 

To be more precise, I want all the propositions appears with the random options except the "none of the above" proposition whom stay under the other ones. 

So my two questions are :

1) is it possible to do it ? 

2) at least is it possible the quizz accept the learner submit with no choices selected?

Thank you

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