PLEASE HELP!

The words and actions of Lemon Brown in "The Treasure of Lemon Brown" makes him seem like?

O Greg's teacher.
O a real person
O Greg's father
O a mythical character.

Which of the following factors most consistently contributes to the speaker’s believability? a the age and experience of the speaker b the physical environment in which the speech is delivered c the sincerity, knowledge, and trustworthiness of the speaker d the position of the thesis statement in the speech