Right away, I can see the correct answer. It's D, Fluent.
Persistent means to keep at it or to never give up on something, so I believe that's false
Obsessed pretty much means something that someone loves so much, it almost possess that someone's mind.
Evasive means to avoid, so that's automatically false.
But to be fluent is usually associated with speaking a language. In this case, the language is English. When children have more practice with words and letters, they become more fluent in English :)
