Answer:
(a) Jason brought three sandwiches for himself.
Explanation:
himself is a reflexive pronoun, and it's the only one that uses the reflexive pronouns correctly and is grammatically correct.
John sells bonds quicker than carol because quicklier is not a real word and I cant believe I helped a high schooler
Answer:
I think that this sentence would be compound if you don't include the word 'and' in your clauses.