How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

It's called the falling actionwrong subject by the way

Hcn is your answer my guy : )

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.