Answer: D
She should: Take notes on the evidence she wants to use, seperate her print sources by category, and mark the pages of her print sources and bookmark her online sources. So, all of these methods will work just fine.
If I were to write a word I would put naïve.
If you want to incorporate 'for a year", you would need to say 'I have been in Poland for a year.'
But as 'been to' suggests just a visit and not a long stay, you may want to use "I had gone to Poland a year ago.'