The most appropriate response to the importance of the conquering of Mecca in 630 for Islam is:
It solidified Islam as a faith and one backed by military support.
This event marked a significant turning point in the history of Islam. The conquest of Mecca not only established the city as the spiritual center of Islam by reclaiming the Kaaba for monotheistic worship, but it also demonstrated the political and military strength of the Muslim community under Muhammad’s leadership. This military success helped to legitimize Islam as a prominent and unified religious and political force in the Arabian Peninsula, leading to the broader acceptance of the faith and significant conversions among the tribes of Arabia.