Texas Penal Code Practice

When a person causes serious bodily injury to another during an act, the offense committed is Aggravated Robbery. Aggravated Robbery is the appropriate choice because it involves causing serious bodily injury to another while committing a robbery.

Burglary of a Vehicle involves unlawfully entering a vehicle with the intent to commit a felony or theft, but it does not specifically address causing serious bodily injury during the act. Criminal Trespass involves unlawfully entering or remaining on someone else's property, which also does not specifically address causing serious bodily injury. Theft of less than $50 simply involves unlawfully taking property worth less than $50, with no mention of causing serious bodily injury.

Therefore, among the options provided, Aggravated Robbery is the most fitting choice when considering the scenario of causing serious bodily injury to another during an act.