Final Answer
The correct option to complete the sentence "Tu hermano Gabriel ___ ir a Europa" is 1) va a.
Step-by-step explanation
In Spanish, when expressing someone's intention or plan to do something, the construction "ir a + [infinitive]" is commonly used. In this context, "va a" is the appropriate choice to convey Gabriel's intention to go to Europe. The phrase "Tu hermano Gabriel va a ir a Europa" translates to "Your brother Gabriel is going to go to Europe," indicating a future action or plan.
The use of "debe," "puede," or "quisiera" would convey different meanings. "Debe" implies obligation or necessity, "puede" suggests possibility or capability, and "quisiera" expresses a wish or desire. Since the question is about Gabriel's intention or plan, "va a" aligns with the future action context.
Choosing the correct expression is crucial in conveying the intended meaning accurately. In this case, using "va a" provides a clear and concise way to express Gabriel's upcoming trip to Europe, emphasizing his intention or plan to undertake the journey in the future.
Correct option is 1) va a.