Which of the following membranes given us the ability to discriminate different pitches of sound ?
(a) Membrane covering the round window
(b) Tympanic membrane
(c ) Tectorial membrane
(d) Basilar membrane

Explanation

To solve the question regarding which membrane allows us to discriminate different pitches of sound, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Ear**:
- The ear is divided into three main parts: the outer ear, middle ear, and inner ear. Each part has specific components that play a role in hearing.

2. **Identifying the Relevant Membranes**:
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