Is the following an argument or explanation?
(a) Seismic data recorded in a number of locations provides evidence that a 7.8 magnitude earthquake occurred near Kathmandu, Nepal.
(b) The earthquake was caused by the sudden release of energy from the collision of two of the Earth’s tectonic plates.
(c) Many people were killed by the earthquake as a result of the poor design and construction of buildings in Kathmandu.
(d) A previous, strong earthquake in the region in 1934 suggests that earthquakes are more likely to occur in this area.