Can we draw the following hypothesis from the context (see options)? 

Context:

It has become increasingly clear that Iran is making rapid progress toward attaining a nuclear weapons capability as U.S. officials have confirmed the presence of various nuclear sites that Tehran has failed to disclose

Hypothesis: All undisclosed nuclear sites are in Tehran.
Available choices:
[A]. Yes;
[B]. It's impossible to say;
[C]. No;
[B].