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If a, b and c are integers such that 0 < a < b < c < 2a, what is the greatest common factor of $$84^{a}$$, $$126^{b}$$, and $$98^{c}$$?
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A.($$2^{a}$$)($$7^{a}$$)
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B.($$2^{b}$$)($$7^{a}$$)
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C.($$2^{b}$$)($$7^{c}$$)
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D.($$2^{a}$$) ($$3^{a}$$) ($$7^{a}$$)
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E.($$2^{b}$$) ($$3^{b}$$) ($$7^{a}$$)
B显示答案
