I don't what it says can you right your question in the comments
In my family there are 5 members.I have 1 sister and 1 brother.I am the Middle child.I have a really good connection with my family and love spending time with them.
In this sentence :
"You also learn what it takes to make money: a lot of effort.”
The main verb is "learn". The verb Takes is also a verb but since it is within the next clause and it is the verb of the Cataphoric refrence "it" such verb cannot be considered the main verb of the sentence.
So your final aswer is Learn.
I think the sentence that uses it correctly is the last one.
Defiantly. Profusely is big, perfunctory is lazily doing something, petulantly is to do something with a bad temper, and defiantly is doing something even though you don't want to