The ethical dissonance model looks at the ethical fit of the organizational and individual values. the optimal fit for an individual with high individual ethics would be:
a. high- high
b. high-low
c. low- high
d. low-low

   A. High- High

Explanation:  Ethical dissonance as such arises due to inconsistencies in attaining and maintaining a moral image of oneself and being tempted to exploit some unethical situation for the sake of personal gain. In other words, it is the interaction of the company / organisation and the individual with the aim of adapting the individual and the organisation in different possible situations and scenarios. It is a two-way process because the ethics of an individual influences the organisation, simply the individual enters his / her  ethics. Also the ethics of the organisation influences the behaviour of the individual.

Of the four possible fit models / options, high-high is one of two fit options that have a high person-organisation fit. So this is a model that provides a fit relationship between the organisation and the individual. When an individual has a high level of ethics, and organisation too, fit with an organisation of course high. That's the case here.

There is another high fit, therefore the agreement of organisations and individuals, but this is not the case here, when a person is of low ethics. Then for that individual it is a high fit of course if it is also a low ethics organisation, such an organisation suits a low ethics individual.

The other two cases of fit are when there is a low level of fit between the organisation and the individual.