Answer:
2, which is option a
Explanation:
The unit rate of lemon juice to sugar is the amount of cups of sugar needed for 1 cup of lemon juice.
We have that for 1/2 = 0.5 cups of lemon juice, we use 1 cup of sugar. So we apply a rule of three.
0.5 cups of lemon juice - 1 cup of sugar
1 cup of lemon juice - x cups of sugar
0.5x = 1
x = 1/0.5
x = 2
So the answer is 2, which is option a