Ben Cardin and Chris Van Hollen
First this belongs in math. But heres the answer.
For every bag you need 3.5 gallons of water. You have three bags so multiply by three. You end up with 3(3.5) simplify and you get 10.5
I choose C and E, but I don't know if you need to only choose 1 (:
A good starting point would be describing the Phoenicians. Saying who they were, when they rose and when they fell, etc. Then end the paragraph with "This is how this magnificent culture influenced Rome" then start your essay on how they influenced it with "The first way the Phoenicians influenced Rome is..."
Hope this helped. Have a great day!