Answer:
Yvonne should pick mixture B which has a lesser concentration of chili oil.
Step-by-step explanation:
Bob's soup concentration = 18 drops / 4 cups = 9 drops / 2 cups = 4.5 drops/cup
A. 18 / 2 = 9 drops/cup which is a greater concentration
B. 18 / 5 = 3.6 drops/cup which is a lesser concentration
C. 20/ 4 = 5 drops/cup which is a greater concentration
D. 22/ 4 = 5.5 drops/cup which is a greater concentration