Women with 18 weeks of pregnancy now present with vaginal bleeding

women with 18 weeks of pregnancy now present with vaginal bleeding with h/o 3 times loss of fetus at 16/18 weeks .what is the cause of her fetal loss ?

A)chromosomal abnormalities

B)cervical incompetence ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;ans

Hormonal imbalance

Ovarian tumor

Valvo vaginitis