Concept:Citizenship rights may be withdrawn by the state under certain legal conditions.
Explanation:A citizen normally enjoys rights protected by the constitution.
However, the state can lawfully withdraw these rights when the citizen is convicted of a serious crime.
Opposing the government violently may attract punishment, but it is not the standard ground for withdrawal of rights.
Leaving the country permanently does not automatically remove citizenship rights.
Being pronounced dead ends the person's legal existence, so rights are not withdrawn but simply cease.
Therefore, the correct condition is a serious criminal conviction.
Answer:C. is convicted of a serious crime