You should signal continuously while turning because:

Signaling continuously while turning is important for safety and communication with other drivers on the road. The correct choice emphasizes the necessity of maintaining both hands on the steering wheel to ensure control of the vehicle during a turn. Keeping both hands on the wheel allows a driver to manage the turn safely and respond to any unexpected obstacles or situations that may arise.

While it is indeed crucial to use your turn signal properly to inform other road users of your intentions, the focus on having both hands on the wheel highlights the practical aspect of vehicle control during maneuvers. This practice is essential regardless of whether the vehicle is equipped with self-cancelling signals or not, as relying on vehicle mechanics rather than driver awareness can lead to unsafe situations.