As the Boundaries of Byzantium Changed in the Seventh Century

As the boundaries of Byzantium changed in the seventh century, which of the following was not a part of this change?

A) It still held southern and eastern shores of the Roman Mediterranean.
B) It added the western part of India as a sphere of influence.
C) It lost much of its eastern area to Arab expansion.
D) Arabs will eventually threaten Constantinople itself.
E) It checked the advance of the Slavic peoples in the Balkans.