Wikipedia has 3 but they don't have Carmona.
Wendy Carillo (Standing Rock and Fight for 15 activist and radio host)
Jimmy Gomez (state assemblyman)
Sarah Hernandez (former teacher and nonprofit leader)
They also have a Green party candidate:
Kenneth Mejia (activist) (Mejia is also a Bernie supporter)
That means 3 out of 5 candidates are vocal Bernie supporters. I'm not sure where the other two candidates stand.
Without knowing anything about them, Gomez and Hernandez seem like the best. I don't trust candidate with the main title "activist".