Before the mosques prayer had been a personal experience. With the introduction of mosques prayer became a social function, where worshippers no longer had to hide. The call to prayer (ezan) became an important symbol of the freedom to assemble and worship. The mosque also served as a school, a function in Islamic society that would be central to the success of Islam. The mosque also served as a shared meeting place and as an office for the administration of the local society. All of these functions are the foundational aspects of a civilization, and Hz. Mohammed was able to bring them to life through the construction of the mosques. C is the correct answer.