Need help with this very confused lol

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

True or false look at the picture pls : /

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups