Greg Has Grown Up to Be a Very Aggressive Person

Multiple Choice

Greg has grown up to be a very aggressive person.Neither of his parents is aggressive.In addition,neither his schoolmates nor his neighbors are particularly aggressive.According to behavior geneticists,what might be happening?

A) Greg is using his own free will to engage in aggressive behavior.
B) Greg has a condition called "negative sociability," which is considered to be neither environmental nor genetic in origin.
C) Genes from Greg's parents combined in a unique (though random) way to create Greg's aggressive tendencies.
D) Greg probably inherited a gene called RH5, which is associated with aggression.