In the second study, Dr. Hussain found ________.

A、thatdifferenttypesofskincanceraremainlyduetotheenvironment
B、thatfamilymemberscoulddevelopmorethanonetypeofskincancer
C、thatexposuretothesunisbeneficialtoskincancerprevention
D、thatfamilymemberstendtodevelopthesametypeofskincancer