**Core Concept**
Klumpke's paralysis results from injury to the lower trunk of the brachial plexus (C8–T1), leading to paralysis of the intrinsic muscles of the hand and loss of motor function in the hand and forearm. It is characterized by weakness or paralysis of the ulnar nerve supply, which affects hand function and may present with claw hand, Horner’s syndrome, and sensory deficits.

**Why the Correct Answer is Right**
In Klumpke's paralysis, the ulnar nerve, which innervates the intrinsic muscles of the hand (e.g., lumbricals, interossei), is affected. This leads to paralysis of these muscles, resulting in a claw hand deformity due to unopposed flexor contraction. Horner’s syndrome can occur due to involvement of the sympathetic chain. The condition specifically involves the lower trunk of the brachial plexus. Therefore, the claim that "claw hand is never seen" is false — claw hand is a hallmark feature.

**Why Each Wrong Option is Incorrect**
Option B: The intrinsic muscles of the hand are indeed paralyzed, so this statement is true.
Option C: Horner’s syndrome can occur due to sympathetic nerve involvement in the brachial plexus, making this true.
Option D: Klumpke's paralysis involves the lower trunk of the brachial plexus (C8–T1), so this is accurate.

**Clinical Pearl / High-Yield Fact**
Claw hand is a classic sign of ulnar nerve involvement in Klumpke's paralysis — it is *not* absent. Always remember: claw hand = ulnar nerve injury = Klumpke’s paralysis.

✓ Correct Answer: A. Claw hand is never seen