4. The best container to buy would be the 28 oz jar.
I got this by finding out how much of each you can get per dollar. Since the 12 oz jar is 99 cents, you can assume it's a little over 12 oz per dollar. For the 28 oz jar, you do 28 / 2.05 which is approximately 13.66 oz per dollar.
12 and some decimal < 13.66 oz per $1.
Thus, the 28 oz jar give you more for your money.