Predict a Correct Sequence of Reactants Required to Complete the Following

Multiple Choice

Predict a correct sequence of reactants required to complete the following synthesis in which propanal is the only carbon-containing product. NaNH₂ CH₃SCH₃ H₂O CH₃CH₂Br O₃ Na/NH₃(l) H₂/Pt I II III IV V VI VII

A) 1. I; 2. III; 3. IV; 4. V; 5. II
B) 1. VI; 2. IV; 3. IV; 4. VII; 5. V; 6. II
C) 1. V; 2. II
D) 1. I; 2. IV; 3. VI; 4. V; 5. II
E) none of the above are correct