The Texas colonists were cruelly disappointed because the Mexican government had not kept its promise to protect their rights.
Who are the Texas colonist?
The Texas colonist were the people of Texans which were dominated by the Mexican authority prior to its Independence and integration into the U.S in late 1800s.
Hence, the Texas colonists were cruelly disappointed because the Mexican government had not kept its promise to protect their rights.
Therefore, the Option C is correct.
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