I would go with "el museo".
Part C:
"Viajar en tren es car. Viajar en carro mas caro que viajar en bus. Viajar en avion es lo mas caro"
Part A:
"Viajar en tren es comodo. Viajar en carro es mas comodo que el tren. Viajar en avion es lo mas comodo."
Hope it help!!
C. pupil
." The Spanish word "pupitre" translates to "desk." So who uses a desk? Puppets, puppies, and puddles do not use desks, but pupils do. "Pupil" is a synonym for "student," so clearly, "pupil" and "pupitre" are connected.