What is ridge push ?

(a) when edges become denser and gravity pulls them downward and away from one another.

(b) cooler and denser crust sinks into mantle.

(c) folding and crumpling and sliding upward creating mountains.

(d) currents just beneath earths crust flow very slowly causing movement in the plates above them.

this is for science.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?