It sounds fine but is there information about it being an inside job
False, you have put the information you find online in your own words and add the works cited of where you found your info.
Sam is older because s=4a
s is Sam and a is Allie. If Allie is 1, then Sam is 4.
Such and such, so Sam is older.
your answer would be C exactly because of your explanation and the hint
