A calibration graph is provided for an ammeter with an inaccurate scale. During an experiment, the meter gives two readings at different times: $0.13\,\text{mA}$ and $0.47\,\text{mA}$. What was the actual increase in current between these two readings?
- A$0.30\,\text{mA}$
- B$0.35\,\text{mA}$
- C$0.40\,\text{mA}$
- D$0.44\,\text{mA}$