I would say knowing how to operate the controls, and knowing how to work a computer will result in success in online learning.
The theme of the story is that is can be hard to work with someone that is the complete opposite of you.
What happens in the story that leads me to believe this is well first of all the two characters names: Katie Clean and Messy Missy are opposite in names. One has messy other has clean. It was hard for them to work becuase Messy Missy was alwaays making a mess, which Katie Clean could not handle.
The best and most correct answer among the choices provided by the question is the first choice. The word that represents the underlined is "large". I hope my answer has come to your help. God bless and have a nice day ahead!
Because the planets have to be aligned just right for it to happen