What does "p. s." means and stands for in emails and letters?

How is the underlined word used in the following sentence? juan was elected president of his class. juan is underlined. a. subject b. predicate nominative c. direct object d. verb

Which statement best reflects how martin luther king, jr. uses rhetoric and style in paragraph 9 of "letter from a birmingham jail" to assist him in advocating the use of nonviolent direct action to achieve justice for negro citizens in birmingham? click here to read the letter.

What can you infer about esperanza's character from the fact that she argues three days with her mother trying to persuade her to write the note?