[单选题]

Statistics alone cannot reveal the width of the ongoing economic change, because the nature of work itself_________ .
A． is being measured successfully
B． is constantly making changes
C． is receiving much radical consideration
D． is increasingly getting challenged

Statistics alone cannot reveal the width of the ongoing economic change, because the nature of work itself_________ .A． is being measured successfullyB． is constantly making changesC． is receiving much radical considerationD． is increasingly getting challenged