Correct Answer: Virtue

Solution : The correct choice is the third option.

Explanation : Belief refers to a conviction or acceptance that something is true, but it doesn't specifically connote ethically good behaviour. Virtual refers to something existing in a simulated or electronic form, and it is unrelated to ethical conduct.

The meanings of the other options are as follows:

• Belief means conviction or acceptance that something is true.
• Virtual means existing in a simulated or electronic form.
• Values mean principles or standards of behaviour.

Therefore, the correct one-word substitute is virtue .