See the multi-choice question below:

Sentence 1: Its pinnacles, buttresses, and cupolas seem to belong to a whole complex of churches, not a single elegant monument.

Sentence 2: The complex of churches is the main attraction of the area, being one of the biggest in the world.

If the first sentence is true, then is the second sentence true?
Options are: (a). yes; (b). it is not possible to tell; (c). no;
(b).