Question #N389

The first time I heard the song "You Say" by Lauren Daigle, I was immediately struck by its beautiful message of hope and redemption. The song is a powerful reminder that even in the darkest of times, there is always light to be found.

Which choice best combines the sentences at the underlined portion to create a grammatically correct and clear sentence?
A. The song is a powerful reminder, that even in the darkest of times, there is always light to be found.
B. The song is a powerful reminder, that even in the darkest of times, there is always light to be found.
C. The song is a powerful reminder that even in the darkest of times, there is always light to be found.
D. The song, is a powerful reminder that even in the darkest of times, there is always light to be found.