The correct answer would be number 4! Hope this helps :)
Answer:
I think it's all of the above. But It could just be Bruder if you have to pick one.
Explanation:
Cognates are two words from different languages that have a common origin/meaning/spelling. All of these German words are very similar to their english definitions.
If none of the above isn't an option then choose Bruder, because I know they have a similar origin.
Practice copying down sentences using words you know. I used to copy poems and it helped a little, but only when it came to writing poetry! You could also find a märchen and copy sentences from that. Sticky notes are my friends! I would put the German word for something (ie: the desk, the lamp, ect) and see those daily. It helped me with der, die, das. Grade wise, I can only encourage you to study and practice writing, reading, and speaking daily. I wish you all the best! Viel Glück!