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# Comparison of Cardinality of Sets of Functions and Sequences

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Which of the following sets has the smallest cardinality?

A

$span_\mathbb{Q}(\mathbb{Q})$

B

The set of Riemann-integrable functions on $\mathbb{R}$

C

The set of monotone increasing sequences in $\mathbb{Q}$.

D

The set of monotone decreasing sequences in $\mathbb{Q}$.