What are the advantages of an anti-slip device (ASR)?

You answered correctly. An anti-slip device (ASR, also known as traction control) helps prevent wheelspin when setting off, especially on slippery surfaces. This means the powered wheels get better traction and the car doesn't spin out or slide sideways easily when you start moving. However, ASR does not prevent the wheels from locking when braking—that is the function of ABS (anti-lock braking system), not ASR. Knowing the difference between these safety systems helps you choose the correct answers in similar questions in the future.