Final answer:
Damage to the amygdala in experimental animals can make them tamer and more sexually active.
Step-by-step explanation:
Experimental animals become tamer and more sexually active following damage to the amygdala.
Animal research suggests that limbic system structures such as the amygdala and nucleus accumbens are especially important for sexual motivation. Damage to these areas results in a decreased motivation to engage in sexual behavior, while leaving the ability to do so intact.
Thus, the correct answer is A. amygdala.