Final answer:
The provided excerpts do not detail why Blanche left her teaching job, but the play 'A Streetcar Named Desire' shows it was due to an inappropriate relationship with a student, not any of the given options.
Step-by-step explanation:
The question pertains to the character Blanche from a play, likely Tennessee Williams' 'A Streetcar Named Desire.' However, none of the provided text excerpts directly mention Blanche leaving her job as a teacher.
The play does reveal that Blanche was dismissed from her job as a teacher due to an inappropriate relationship with a student, not due to options 1, 2, or 4 as listed. It is this scandalous behavior, resulting in her forced leave, that contributes to Blanche's complex character and sets the stage for her subsequent downward spiral.