Bobby's Mom is trying to increase the number of times that Bobby shares his toys with his younger brother. When Bobby shares his toys, his Mom praises Bobby and plays with him, but when Bobby refuses to share his toys his Mom does not praise him or play with him. As a result, Bobby increases the number of times he shares his toys with his younger brother.
This is an example of:

A) DRO.
B) shaping.
C) DRL.
D) DRA.

99 points which of the following selections is least useful for supporting the claim that states intentionally built unequal school systems to separate the races? question 1 options: a. the supreme court ruling in plessy v. ferguson (1896) declared segregation of schools to be unconstitutional. b. it was very clear by the mid-1900s that southern states had expertly built separate educational systems. these schools, however, were never equal. c. states with laws keeping schools segregated never gave equal amounts of money t o their black and white schools. d. ten years after brown, fewer than 10 percent of southern public schools had integrated. some areas did not comply at all.