I'm assuming that the words from the excerpt (which you didn't provide, by the way) that suggests that Claudius plans to control Hamlet is C. fetters.
The reason why I'd choose that word is because fetters are chains or shackles used to restrain someone.
C. an understood you, because usually you is the subject in the sentence, but it is understood without it.
Answer:
Perubahan keadaan jirim juga perubahan fizikal. ... cair dan berubah bentuk daripada pepejal kepada cecair, air tersebut masih lagi mempunyai sifat air.
