Under which circumstances can the ICJ exercise contentious jurisdiction?

A、TheCourtwillonlyexercisejurisdictionwherestatesspecificallyreferadisputetoit.
B、TheCourtcanactinacaseifthepartieshaveconferredjurisdictionuponitbysomevoluntaryactofconsent.
C、TheCourtcannothearacasewherethereisnotconsentbythepartiestothedispute.
D、TheCourtcanalsoexercisejurisdictionoverdisputesarisingfrominternationaltreatieswhereparticularprovisionswhichhavebeenspecifiedrefersuchdisputestothejurisdictionoftheCourt.