Which clue best readers know that the first two paragraphs of my story are structured chronologically? the author writes from the first-person point of view. the author includes the years events happened. the author discusses why black people were angry. the author shares information about bus drivers.

The author includes the years events happened.

When we tell a story in chronological order, we are describing the events in the order of occurrence in time. Most stories are arranged in this way in order to make the chain of cause and effect clear to readers. Events are also arranged chronologically in areas of studies such as history. In this case, the fact that the author includes the years events happened indicates that he is writing following a chronological structure.

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)