Answer:
The controlled variable is straws. Independent it the water and dependent is the capillary action.
Step-by-step explanation:
The Independent variable is the water because its not chaninging thorughout the experiment and has no conqueunces on the other varibales. The controlled is the straws because you are controlling the different diameters in which the straws are (narrow/wide). Then as you change your controlled variable your dependent varible will change- which is the affect on capillary action.
Hope this helps.