The correct answer is an evocative gene-environment correlation.
An evocative gene-environment correlation refers to the phenomenon where the behavior that an individual has inherited elicits or leads to an environmental response. In this instance, Vernon's (inherited) temperament is active and friendly due to which his parents provide him with social stimulation. On the other hand, Vivian, who has a more passive and quiet nature (inherited) receives less stimulation from her parents.
Since Tony belongs with the peer culture the nerds, it is expected that Tony is into geeky things and mostly involved with academic activities in which his brain is being used in participating such activities and engage in activities that uses cognitive functions.
Answer:
a. proved essential for the success of Grant’s attrition strategy.
Explanation:
The Union is known as the "North" and the Confederacy is known as the "South".
At the event of the American Civil War, the Union also know as the "United States of America" under the presidentship of Abraham Lincoln was opposed by 11 southern states known as the "Confederate States of America" under the presidentship of Jefferson Davis.
Abraham Lincoln believed that he could win over the Confederacy states until and unless he have control over the border states, mainly Maryland.
Union's man power was more as they had nearly 20 states associated with them.
The Union in order to win over the Confederacy States made strategies to gradually reduced the power of the Confederacy States.
Thus the advantage that the Union's soldier or manpower have over the Confederacy has proved to be essential for the success of Grant’s attrition strategy.
Hence the answer is
a. proved essential for the success of Grant’s attrition strategy.