The correct answer is D) a territory of México.
The status that Texas officially had after the treaty of Córdoba was "a territory of México."
When the "Trigarante Army of México(Three Guarantees)," led by General Agustín de Iturbide defeated the Spanish Army to became an independent nation, negotiations of terms concluded with the signing of the Treaty of Córdova on August 24, 1821, in the city of Córdoba in the Mexican state of Veracruz. Iturbide signed the treaty on the Mexican side. On the Spaniard's side, it was signed by the representative of the Spanish crown, Juan O'Donojú. Under the Treaty of Córdoba, the status of Texas was of a territory that belonged to México.
