"No man is an island" (Line 1, Para. 3) implies that ______.

A．teenagers without friends will suffer from psychological problems
B．a widow or a widower will die very soon without companionships
C．human beings need companionships and a sense of belonging
D．both A and B

A．run by the Government or our local authorities
B．in constant need of financial support
C．unable to provide for the needs of the population
D．financed wholly by rates and taxes