Question

A. ​she's a single​ parent, works, and goes to school and i really admire her.
b. ​she's a single​ parent, works, and goes to school i really admire her.
c. ​she's a single​ parent, works, and goes to​ school, i really admire her.
d. ​she's a single​ parent, works, and goes to school. i really admire her.

Answer 1

If this is about proper grammer usage, then option D would be correct.