"Builders were held legally accountable for their work."
<span>Call of the Estate General (May 5, 1789) </span>
Well, I can tell you for sure that a is not the answer. But I think the answer would be b.
The answered to your question is rudder. The rudder is a fin-like object on the back of a ship. It allows the ship to not rely completely on the sails to change direction.