The diagrams illustrate a spring and a graph showing the spring’s length plotted against the load on it. What is the extension of the spring when a load of $40\,\text{N}$ is applied to it?
- A$1.5\,\text{cm}$
- B$2.5\,\text{cm}$
- C$4.0\,\text{cm}$
- D$6.5\,\text{cm}$