Answer :
The correct answer is C. Semicircular canals.
Explanation
The semicircular ducts are a part of the inner ear, they are small ducts that contain fluid inside. The semicircular ducts work when they undergo a movement, causing the liquid inside to move and touch the small hairs inside. These hairs send a nervous signal to the brain so that it determines how to maintain the body's balance.
An example of this is the case of Leila and Liam, who underwent a roller coaster movement, causing the liquid in their semicircular ducts to move and touch the hairs in the ducts, sending a nervous message to the brain, this continues even when they get off the roller coaster, that is why Leila and Liam continue to feel that sensation of movement and dizziness. So, the correct answer is C. Semicircular canals.