Final answer:
The heritability of most Five-Factor Model (FFM) traits is moderately heritable, with studies indicating a heritability ratio of more than 0.50, suggesting a significant genetic component to these personality traits.
Step-by-step explanation:
The heritability of most traits in the Five-Factor Model (FFM) of personality is considered to be moderate. Specifically, based on studies like the Minnesota Study of Twins Reared Apart, heritability ratios for certain personality traits have been found to be more than 0.50. This suggests that traits such as leadership, obedience to authority, sense of well-being, alienation, resistance to stress, and fearfulness are moderately heritable.
Although the Minnesota Study highlights the significant role of genetics in personality, it is important to note that heritability ratios do not reflect the influence of a single gene but rather the combined effect of multiple genes and epigenetic factors. Therefore, any single FFM trait's heritability is not solely determined by genetics but also influenced by the environment. Taking this into account, the correct answer to the question 'What is the heritability of most FFM traits?' would be c) 50% - moderately heritable.