9) D

A – Correct
The table shows that when number of mutant alleles increase from 0 to 1, the risk value also increases from 1.0 to 1.5 in the light drinker category, and from 4.0 to 4.5 in the heavy drinker category.

B – Correct
There is a positive correlation between heavy drinking and light drinking. Risk values are much higher for heavy drinkers than for light drinkers.

C – Correct
Addition of a mutant allele increases the risk factor by 0.5. Heavy drinking increases the risk factor by 3.0.

D – Wrong
Heavy drinking is the main factor for increasing risk as discussed in option C.

E – Wrong
Presence of 2 mutant alleles in light drinkers increases the risk factor by 0.8.
Presence of 2 mutant alleles in heavy drinkers increases the risk factor by 2.0.