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.

D) DRA.  

Explanation:

DRA: In psychology, the term "DRA" is denoted as "differential reinforcement of alternate behaviors" and is described as a procedure that is responsible for decreasing specific problematic behavior whereby reinforcement is being delivered or given to behavior that is considered as serving desirable alternative towards the behavior that is targeted for withheld and reducing specific instances associated with the problematic behavior.

In the question above, the given statement is an example of DRA.

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d

the answer to your question is,

old stone age.

-mabel < 3