Which number represents the possibility of an event that is very likely to occur

What’s the answer answer to this question

Janet is mixing a 15% glucose solution with a 35% glucose solution. this mixture produces 35 liters of a 19% glucose solution. how many liters of the 15% solution is januet using in the mixture? a. 25 liters c. 28 liters b. 7 liters d. 10 liters

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c?