The diagram displays a wave trace on a cathode-ray oscilloscope. The spacing between adjacent vertical and horizontal gridlines is $1.0\,\text{cm}$. The voltage scale is $4\,\text{V cm}^{-1}$ and the time scale is $5\,\text{ms cm}^{-1}$. What are the amplitude and period of the wave?
- Aamplitude $= 1.5\,\text{V}$, period $= 4\,\text{ms}$
- Bamplitude $= 5.0\,\text{V}$, period $= 10\,\text{ms}$
- Camplitude $= 6.0\,\text{V}$, period $= 20\,\text{ms}$
- Damplitude $= 12.0\,\text{V}$, period $= 20\,\text{ms}$