Because she was treated like a ranch hand and expected to work on the farm and she wasn't really given any freedoms for her first marriage and her second marriage started off good but her husband later became abusive beating her and calling her names. Neither of these marriages she could really leave because she wouldn't have anywhere to go and once she did then she left.
The sentence that is a compound sentence would be B. Since it provides 2 mail points or actions combined within a single sentence, there are 2 main events occurring within the sentence whereas the other options only describe one.
Mark saw the kangaroo, but he didn't take a picture.
Both Mark seeing the kangaroo and not taking the picture are these events combined within this sentence.
It helps the bird to reach food in hard to get to places.