There are some statements about Hall Effect. Which of them is NOT correct?

A、Therewillbeavoltageacrossacurrent-carryingconductorifitisplacedinamagneticfield.;
B、Thechargescanescapefromthemetalsurfacewhentheyabsorbenoughenergy.;
C、Therearemorethanoneforceactingonthemovingcharges.;
D、HallEffectcanbeusedtodistinguishp-typeandn-typesemiconductors.