The most likely idea espoused by the text is that D. European rulers primarily used Christianity as a means to control their people and to increase their own wealth and influence.
You did not include the passage but this is the most likely answer.
For as long as there has been religion, it has been used by the powerful to control their people and this was the case with European leaders and Christianity.
European leaders used Christianity to increase their power and influence. For instance:
In conclusion, religion was used by European leaders to increase their influence and by extension, wealth.
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