The second paragraph mostly contains the personal hardships the speaker has in her life as a Negro woman. Specifically, the sentences wherein she talks about no one helping her into carriages, ploughed and gathered in the farm, eat and work as much as a man, and being sold off to slavery best describe the emotional appeal she wanted to convey.
D. because 'the family' and 'they' is singular.
Become is a example of a "linking verb." A linking verb is a verb that describes a object while connecting it to another noun or adjective. A example of a linking verb would be something like: The eggs smells rotten, or Jared has become a werewolf.
Hope this helps.