Questions slides have weird spacing on answer options.

Hi,

I am creating a large Question set (1500 slides) and need to have a template that works well, I'm mostly there.

I can import a txt file to populate a template that I have created, however I keep finding that large spaces are left between the Answer options which looks terrible. I can't see why it would do this, sometimes the answers are so spaced out that the last option disappears off the text box and you would have to use the slider to find it. I've tried rebuilding and copying the text box from other templates but I keep getting the same result. I've attached some screen grabs and the quiz import file, any help would be gratefully received. 

Thanks

Richard