The mechanical advantage (MA) of a lever can be calculated using the formula:
\[ MA = \frac{\text{Effort arm}}{\text{Load arm}} \]
In this case:
- Effort arm = 15 meters
- Load arm = 5 meters
Substituting the values into the formula:
\[ MA = \frac{15 , \text{m}}{5 , \text{m}} = 3 \]
Therefore, the mechanical advantage is \(3\).
The correct response is: 3.