B  
Hysteroscopy allows direct inspection of the uterine cavity and is the preferred test to identify congenital septa, bicornuate uterus, adhesions or sub-mucous fibroids—anatomic defects that account for many second-trimester pregnancy losses. Studies of women with recurrent mid-trimester abortions show uterine anomalies on hysteroscopy in up to 48 % of cases, far more often than chromosomal or endometrial pathology [Dendrinos 2008, PMID 18465483; Turocy 2019, PMID 30683511].