Answer:
The correct answer is c) despega, that means “to take-off”. So, the phrase remains like this: Primero, el avión despega (First, the airplane takes-off).
Step-by-step explanation:
The phrase refers to what an airplane does first, so the process is the following: first, it takes-off (despega), then flies (vuela) and then lands (aterriza). Which makes the option c) despega as the correct answer, for it has the first moment of the process that an airplane follows in a flight.
The option come means to eat, but given that an airplane doesn’t eat, this isn’t a possible option.