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To find the speed of the waves, we first need to determine the frequency and then use the wave speed formula.
1. **Calculate the Frequency:**
- Number of waves = 2
- Time = 4 seconds
\[
\text{Frequency} = \frac{\text{Number of waves}}{\text{Time}} = \frac{2 \text{ waves}}{4 \text{ seconds}} = 0.5 \text{ Hz}
\]
2. **Determine the Wavelength:**
- Wavelength = Distance between wave crests = 2 meters
3. **Calculate the Wave Speed:**
\[
\text{Wave speed} = \text{Frequency} \times \text{Wavelength} = 0.5 \text{ Hz} \times 2 \text{ m} = 1 \text{ m/s}
\]
Based on this calculation, the speed of the waves is **1 m/s**.
The answer is **A 1 m/s**.