Read the text and determine if the sentence is true (see options at the end):

The Altenburg is located in the Jenaer street which lies just outside of Weimar's city centre beyond the Ilm park. It was built in 1810-1811 and during the years following 1848, Princess Carolyne of Sayn Wittgenstein and her husband, Franz Liszt, lived there.

Sentence: Altenburg was occupied before 1848.
Possible answers: (a). Yes; (b). It's impossible to say; (c). No;
(b).