Future, it would be really handy if you could see the question verbatim.
I have read an awful lot of SATs questions of late because I've been tutoring my son who has autism and dyslexia.
What I suspect the question asks is, 'Do the following statements express certainty, possibility or impossibility'.
The children will have been taught to scan the questions for the expressions 'may, might could' (possibility) 'will, shall' (certainty) or 'won't, can't, wouldn't' (impossibility). They will be looking for those specific words, so, in the case of the above, it's possibility.
My son is sitting these next week. The dyslexia is severe (reads to about Y1 level and can only hold words in place for about 7 minutes before they just dance about), and he has autism, but he can answer this question. He might think, 'That's just stupid', but he'll know to listen for the 'may' and check the right box.
Don't get me wrong - SATs are vile and unnecessary things, but you have to see the grammar of the thing like maths. DS hated grammar until I turned it into maths and taught it as 'may = possibility' and 'Past tense + verb 'to have' = perfect tense' and 'If a sentence starts 'If I/he/it... and asks for the subjunctive mood, write the pigging word 'were' and then stick two fingers up at the fucking government...'
He can't read and struggles with society in general, but he can hit about 80% on the grammar test (he is a very clever boy). This is lucky, because he's pretty well out of the spelling part. He'll be left high and dry for the reading test where he won't get a reader, and he will be expected to pass the paper despite the fact that his brain can't see the words. If he doesn't, he'll have to repeat it next year when the same thing will happen unless they magically rustle up a cure for dyslexia in the next 12 months.