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Simplify complex fractions

Google Classroom

Which expression is equivalent to the following complex fraction?

start fraction, space, start fraction, d, divided by, 4, end fraction, space, divided by, start fraction, 3, divided by, d, end fraction, end fraction

(Choice A)
start fraction, d, divided by, 4, end fraction, dot, start fraction, d, divided by, 3, end fraction
(Choice B)
start fraction, 3, divided by, d, end fraction, dot, start fraction, d, divided by, 4, end fraction
(Choice C)
None of the above

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