C. À.
The reason being that for cities, any city, we use à, we never use en, au or du or anything else.
amusante
longue
active
généreuse
belle
blanche
nouvelle
___________________________________________
intelligente
bonne
courte
blonde
timide
grosse
sportive
<span>B for beauty: beau (beautiful), joli (pretty)A for age: jeune (young), vieux (old), nouveau (new)G for goodness: bon (good), meilleur (better), mauvais (bad), gentil (kind)<span>S for size: petit (small), haut (high), gros (fat)</span></span>