What aspect of culture does influence urbanization?

C is the correct answer because culture plays a crucial role in shaping the development of community institutions within urban areas. Community institutions, such as schools, religious organizations, and local governments, are often a reflection of the cultural values, beliefs, and practices of the populations that inhabit the city. These institutions influence how communities interact, govern themselves, and provide services to their members, thereby directly affecting urbanization patterns.

In contrast, the other choices do not accurately represent the influence of culture on urbanization. Random selection of construction materials does not reflect cultural values or impact the overall character of a community. Uniform architectural styles might suggest a lack of cultural diversity rather than a significant influence of culture; they could indicate standardization based on economic factors or planning regulations rather than cultural expression. Lastly, the idea that culture ignores social interactions in city growth contradicts the essential role that cultural norms and practices play in forming the social framework of urban life. Social interactions are fundamentally anchored in cultural contexts, which guide how urban spaces are utilized and how communities develop.