The correct answer is A) a break in relations between the East and West.
One effect of the Iconoclast Controversy on the Byzantine Empire was a break in relations between the East and West.
Here we are talking about the use of saints and other religious figures during the 8th and 9th centuries in the Eastern Roman Empire or the Byzantine Empire. The people who rejected the use of those religious figures were called the Iconoclasts. They were against the ide of creating idols that could be venerated or worshipped. In 730, Emperor Leo III prohibited the use and veneration of those figures.