Answer: c'est is shortened for ca est which means it is. Elle est is she is
c'est is typically used for objects and il/elle est are used for people
Answer:
entendre: to hear
dire: to Say/ speak
permettre: to Allow/ consent
passer: to spend
marcher: to walk
I believe the answer is c because you do need a backpack to keep up with your noteboks and textbooks