Final answer:
The correct option to complete the sentence is 'el tanque.'
Step-by-step explanation:
The correct option to complete the sentence is 'el tanque.'
So, the complete sentence would be: 'Mi papá llena el tanque del carro antes de ir de viaje.'
This sentence translates to: 'My dad fills the car's tank before going on a trip.'
Learn more about Completing a sentence in Spanish