Transfer this Active Voice sentence into the Passive one:

“It is known that pirates kidnapped Julius Caesar on the way across the Aegean Sea.”

A. It is known that Julius Caesar had kidnapped by pirates on the way across the Aegean Sea.

B. It is known that Julius Caesar was kidnapped by pirates on the way across the Aegean Sea.

C. It is known that Julius Caesar was kidnapping by pirates on the way across the Aegean Sea.

D. It is known that Julius Caesar kidnapped pirates on the way across the Aegean Sea.