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If $$a$$, $$b$$ and $$c$$ are integers such that $$0 \lt a \lt b \lt c \lt 2a$$, 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
