Social mobility occurs because of

(a) social change and availability of talent.
(b) a shift in the "culture of poverty."
(c) random, unexplained factors.
(d) genetic transitions in the population.

(A) social change and availability of talent.

Explanation:

Any change in the status of any individual or group of people is called social mobility. It is the movement of any category of people in a social strata or hierarchy. It can be upward or downward depends on the movement from the current social position of an individual. While some people restrict social mobility because it threatens to break society modern opportunities have provided enough space for it. For example, a child who works hard in academics can escalate his social position.

"the importance of the japanese economy and security is far greater than that of the asian values"

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;