What Happened Three Years After Mexico Gained Its Independence from Spain

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

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