The illusion based on the concept that most people live in a world with lots of buildings and corners is the:
b) Ponzo illusion
The Ponzo illusion is a visual illusion in which two objects that are the same size appear to be different in size due to the context provided by converging lines resembling railroad tracks, which gives the impression of depth and distance. This illusion is often explained by our brain's perception of objects in a three-dimensional environment, which is influenced by our real-world experiences, such as buildings and corners.