What is the best alternative of the word "address" in the first paragraph

A．a better explanation of the great issue of our time has some advantages
B．nonspecialists can get help from studying in colleges and universities
C．education system will benefit from the research of the great issue of our time
D．all of the above

A．We are living in a transformed world, so it's necessary for us to raise the education standard.
B．The transformation calls for a better understanding of the happening of our time and an anticipation of major techno-logical tendency.
C．The transformation calls for enlarging colleges and universities and helping policy-makers make better policies.
D．Problems resulting from transformation are so hard to solve that we must mobilize a wide range of talent to solve them.