Premise: Archaeologists have located some 7,000 of these nuraghi structures around the island, most of them flattened cone towers believed to be parts of fortified citadels.

Hypothesis: Archaeologists found a bunch of structures made of marble.

Does the premise entail the hypothesis?

Options are:
[A]. yes;
[B]. it is not possible to tell;
[C]. no;
[B].