B. You, because the word you is the first word of the question and the fist letter of the first word at the beginning of a new sentence is capitalized.
They saw a lot of Abandoned Horses.
Assuming the author is the speaker is the best option. Also, reading the peom out loud is another strategy.
The poem shows two birds, one of the birds are free and is able to live out in the wild, while the other is caged and is not able to live out in nature. Due to the caged birds suffering it starts to sing to cope with its suffering and to show its wanting for the same freedom the other bird has.
Hope this helped :)
