It can't be A, B, nor C because some of the equations wouldn't have a straight line if displayed in a graph. For example A has a square root symbol and b and a have an exponent they would create a perebula where that would mean the equations would not make a straight line. However, Choice d doesn't have any exponents, or square root symbols meaning the equation could slope up or down in a STRAIGHT line in a graph.
Genetic influences play a part in many mental and personality disorders. Reduce frontal-lobe activity is a characteristic of many disorders such as alcohol dependence.
