An author can develop a character by giving a physical description using the character's speech or thoughts using another character's speech or thoughts all of the above

All of the above can help to develop a character. A reader will have a clearer image of the character if they are given a description of what the character looks like. We also know who they are as individuals if we know their thoughts or hear them speak. Other characters' opinions of this character can also help to develop them, because we learn who the character is through other peoples' eyes. Hope this helps.

Question 4 i think is expository