philosophy logic (Natural Deduction in Propositional Logic )

Question

Either deposits should be required on beer and soft drink containers, or these containers will be discarded along highways and the countryside will look like a dump. If these containers will be discarded either in parks or along highways, then deposits should be required on soft drink containers. Therefore, deposits should be required on soft drink containers.

(B, S, H, C, P)

P.S: indirect proof(IP) cannot be used! 

- suggest using Reductio ad absurdum and Conditional Proof if needed 

Answer 1

B and S or H and C

(P or H) --> S

prove: S

if B and S then S holds by simplification

if H and C, then H holds by Simplicifaction

Then P or H holds, which implies S.