**Core Concept**
Bilateral abductor paralysis of the larynx refers to the inability of the vocal folds to abduct (move apart) due to paralysis of the posterior cricoarytenoid muscles. This muscle is responsible for opening the glottis, allowing for normal breathing.

**Why the Correct Answer is Right**
In bilateral abductor paralysis, the vocal folds are unable to move apart, resulting in a voice that is breathy and weak. This is because the posterior cricoarytenoid muscles are paralyzed and cannot open the glottis. As a result, the vocal folds remain in a partially closed position, causing the voice to be muffled and weak. The patient may also experience difficulty breathing due to the narrowed glottis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because in bilateral abductor paralysis, the vocal folds are unable to move apart, resulting in a breathy and weak voice, not a hoarse voice.
* **Option B:** This is incorrect because in bilateral abductor paralysis, the vocal folds are unable to move apart, resulting in a breathy and weak voice, not a nasal voice.
* **Option C:** This is incorrect because in bilateral abductor paralysis, the vocal folds are unable to move apart, resulting in a breathy and weak voice, not a stridor.

**Clinical Pearl / High-Yield Fact**
In bilateral abductor paralysis, the patient may also experience difficulty breathing due to the narrowed glottis. This can be a life-threatening condition if not treated promptly.

**Correct Answer:** C. Breathless or weak voice