Stella's sister will need to stay in Texas for four months. Can she legally drive with an out-of-state license for four months? Yes. As long she has a Class B driver license. No. She will need to obtain a Texas driver license within 90 days. Yes. She has a valid out-of-state driver license. No. She will need to obtain a Texas driver license as soon as she's in Texas.

## Step 1<br />This problem is about understanding the laws regarding driving in a state with an out-of-state license. The situation is that Stella's sister is planning to stay in Texas for four months and wants to know if she can legally drive with her out-of-state license during this time.<br />## Step 2<br />The answer to this question depends on the specific laws of Texas. In general, most states allow visitors to drive with their out-of-state license for a certain period of time. However, the specific time frame can vary from state to state.<br />## Step 3<br />In Texas, the law states that visitors must obtain a Texas driver license within 90 days if they plan to stay for more than 90 days. This is to ensure that all drivers in the state are familiar with the state's traffic laws and regulations.<br />## Step 4<br />Therefore, Stella's sister will need to obtain a Texas driver license within 90 days if she plans to stay in Texas for four months.