Your multiple choice quiz asks how long the Babylonian Nezifah is. You propose that the 'correct' answer is 30 days (b).

But the Gemara's discussion seems to indicate that the Babylonian Nezifah is just 1 day, or answer (c)! Can you please check which is the correct answer?

Thank you, Avraham Tallant

Avraham Tallant, Jerusalem, Israel