The situation described involves two waves with different amplitudes coming together, resulting in a measured amplitude that is lower than either of the individual amplitudes. This behavior is characteristic of destructive interference, where two waves combine in such a way that they partially or completely cancel each other out.
In this case, the waves have amplitudes of 52 units and 98 units, but at the specific point and time, the combined amplitude is only 46 units. This indicates that the two waves are interfering destructively.
Therefore, the correct answer is:
A. destructive interference