Answer:
D: It allowed Christianity to spread throughout the entire Roman Empire
Explanation:
I just recently learned about this and I took a test and I believe it is write cause i got a 100% on the test.
But i hope you have a wonderful day
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During<span> the 1960s the availability of primary sources made historical research and</span>writing<span> possible and the debate became more vigorous. Historians Herbert Feis and Gar Alperovitz raised searching questions about the </span>first use<span> of nuclear weapons and their broader political and diplomatic implications.</span>
Because they where being attack
each branch of govenment (legislative, judicial or executive) "checks up" on the other branches ensuring that each branch has equal power & that one branch is not more powerful than the others