The correct answer is "στη σύγκλιση των λιθοσφαιρικών πλακών." This is because the term "σύγκλιση" means convergence in Greek, and it refers to the process of two lithospheric plates moving towards each other and colliding. This collision can lead to various geological phenomena such as the formation of mountains, earthquakes, and volcanic activity. Therefore, the convergence of lithospheric plates is a significant factor in shaping the Earth's surface and is the most appropriate explanation in this context.