A) Katara/Aang, forever and ever and ever.
B) Katara/Toph, they can be very femmeslashy at times.
C) Katara/Zuko, do not want.
D) She was attracted to and interested in Aang from day one. Deal.
E) Zuko, way too much bad history and it took almost the entire series for her to become civil with him, let alone friendly.