Three Years After Mexico Gained Its Independence from Spain in 1821

Three years after Mexico gained its independence from Spain in 1821, the area that is now Texas (then known as Tejas y Coahuila)

A) crowned its first king and did away with constitutionalism.
B) became its own nation and wrote its own national constitution.
C) became part of a dictatorship for the first time and lost all sovereignty.
D) became part of a federal republic for the first time and adopted its first state constitution.