On increasing the temperature of a conductor, its resistance increases because

Options

A. Relaxation time decreases
B. Mass of the electrons increases
C. Electron density decreases
D. None of the above

Explanation

To understand why the resistance of a conductor increases with temperature, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Resistance**:
The resistance \( R \) of a conductor is given by the formula:
\[
R = \frac{\rho L}{A}
...