D is the correct answer
Muslims believe in one god
Christians believe in one god but believe he comes in three forms: god the father, god the son and god the Holy Spirit (trinity)
Jews believe in one god
Well, first we have 4 quarters, or $1. Then, since 2 nickels= 1 dime, we also have 6 dimes and 1 nickel. Simplified, he now have $1.65.
Trade and warfare. Trade can increase the countries wealth where war can destabilize a region leading to economic downturns.