Which of the following statements is true?

Option (A): The movement of plates causes earthquakes and hence has a direct relation to earthquakes. 

Option (B): Weak zones are called "Seismic Zones" is the true statement because the term "seismic zones" is used to refer to those weak zones or regions where earthquakes are more likely to occur. These zones are characterized by a higher frequency and intensity of seismic activity compared to other areas.

Option (C): The location where earthquakes occur is called a plate boundary. It is a false statement as a plate boundary is the location where two plates meet.

Option (D): Earthquakes are caused by volcanic eruptions is a false statement as the majority of earthquakes are caused by the movement of tectonic plates and not volcanic eruptions.