It could not be alliteration, since the words should start with the same letter in the same line.
it could be repetition since 'no' is beong repeated.
it could not be assonance, since the vowels are not being repeated with the same sound.
it could not be rhyme, because the words dont sound the same.
so (b) it is.
She kills herself because they couldn't be together anymore
The word "gives" indicates the cause because it is showing what the cause does. Hope that helps :)
The last one
Hope this helps