Answer: C. viven
Aunque viven aquí tantas comunidades religiosas, no hay problemas.
Although so many religious communities live here, there are no problems.
Explanation: the subject in the main sentence is "comunidades", that is a third-person in the plural, so the verb must be conjugated in this form: Ellas viven aquí.
[tex]\textit{\textbf{Spymore}}[/tex]
