The two factors that influenced the growth of Christianity in East Africa from the options provided are:
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Influence of a captured Syrian - This refers to early Christian missionaries and scholars who played a significant role in introducing and spreading Christianity in the region, contributing to its growth.
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Trade with Greeks and Romans - The interactions and trade with these cultures helped facilitate the exchange of ideas, including religious beliefs, which contributed to the spread of Christianity in East Africa.
The other options, while historically significant, are less directly related to the growth of Christianity in East Africa specifically.