**Core Concept**
The semicircular canals are part of the vestibular system in the inner ear, responsible for detecting rotational movements and balance. They contain a fluid called endolymph and are filled with sensory hair cells that respond to changes in fluid movement.

**Why the Correct Answer is Right**
The semicircular canals are specifically designed to detect angular acceleration, which is the rate of change of the direction of linear velocity. This is achieved through the bending of the sensory hair cells within the canals, which are embedded in a gelatinous structure called the cupula. When the head rotates, the fluid in the canals lags behind, causing the cupula to bend and stimulate the sensory hair cells, sending signals to the brain. This information is crucial for maintaining balance and orientation.

**Why Each Wrong Option is Incorrect**
**Option A:** Linear acceleration refers to the rate of change of linear velocity, which is detected by the otolith organs (utricle and saccule) in the vestibular system, not the semicircular canals.

**Option C:** Both linear and angular acceleration are detected by different parts of the vestibular system, and the semicircular canals are specifically designed to detect angular acceleration.

**Option D:** The semicircular canals do perceive movement, so "none" is incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the vestibular system is responsible for detecting changes in head position and movement, and the semicircular canals play a critical role in maintaining balance and preventing vertigo.

**✓ Correct Answer: B. Angular acceleration**