Why not A bheil i saor?
I've added it.
'An e ' not acceptable ?
the answer given as correct is not one of the optiona
Why is there a switch from using i to e for it?
E is used when you are referring to masculine nouns and i is used for feminine nouns. Weather, for example, is a feminine noun, so i is used. Where you don't know what it refers to, either is acceptable.