The correct answer is B.
All the possible answers refer to problems that consitute important challenges for the human race in the current world.
However, only the warfare problem in B refers to direct violations of Human Rights that could be addressed by the group mentioned. Wars constantly set a threat on many human lives, which many times are murdered by their own states or govemernts, or due to the fact that goverments fail to protect their citizens against external attacks.
Although A or D are connected to economic structural problems, whose consequences can be extremely serious they do not constitute direct violations of human rights.
And decolonization is actually a process that aims to change a situation in which, quite probably, human rights were formerly violated. But in this case it cannot be the answer because, in fact, it is a process of recovery and not the situation that caused the violation.
