Explanation:

- The carpet's cost is Rs. 4.80 per meter, and its width is 90 cm (which is 0.9 meters).

- The room is 10 meters long. Thus, we need to determine how much carpet covers this length.

- Total cost given is Rs. 960.

- Let's calculate:

- First, determine how many meters the Rs. 960 represents at Rs. 4.80 per meter:

$$

\text{Meters of carpet} = \frac{960}{4.80} = 200 \text{ meters}

$$

- Since each strip of the carpet is 10 meters long, calculate the breadth:

$$

\text{Breadth of the room} = \frac{200 \, \text{meters}}{10 \, \text{meters/strip}} \times 0.9 \, \text{meters/strip} = 18 \text{ meters}

$$

- The breadth of the room is thus 18 meters.

- Correct Answer: Option 3 - 18 m