I'm not sure I guess it depends
but the question is asking
if something is SWEET,you probably want to drink sour lemonade with it
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!!
It is correct the last word is intellgente which makes this a noun adjective agreement.