Karl Marx, the founder of Marxism, formally was the citizen of which one of the following countries?

Karl Marx was born in the Kingdom of Prussia (prior to the 1871 unification of Germany) and formally renounced his Prussian citizenship in December 1845. Thereafter, while living in exile in France, Belgium, and the United Kingdom until his death in 1883, Marx remained stateless and was not a formal citizen of Germany, France, or the United Kingdom. Thus, ‘None of the given options is correct’ is the right answer.