The best way of characterizing what sociologists currently believe about upward social mobility for any individual is that it is the result of the policies of government the nature of the education system the effort of individuals the effort of individuals and a society (and its public policies) that enable it

the effort of individuals and a society (and its public policies) that enable it

Explanation:

                     Social mobility is a sociological theory that enables a person to maintain the status in the society when that person reaches at a very high position and earns a lot of respect and wealth.

                     It is the individual's hard work and effort that enables them to move up in the social status ladder to gain respect, name and fame.

Social mobility is also called as Social hierarchy where an individual move up or move down in the social hierarchy order.

Thus the answer is

the effort of individuals and a society (and its public policies) that enable it

so we know the answer cannot be c because no insect or animal starts as an adult

the answer is a. a swimming larvae

because since they are sea animals they automatticaly have to know how to swim they cannot just sink to the bottom

sorry if this is the incorrect answer.