Go with D.) Ustedes, because you are talking to more that one person that you don't know.
Frio, aguadito con el sol, y con toda la energia caliente, se derrite
Yo no quiero helado, prefiero comer pizza. E
The word glorieta haves a lot of meanings. In my point of view glorieta means like a store . So the sentences is: Yo fui a comprar comida en una glorieta
