Convert all amounts to the same unit (cents) and compare.<br><br>
&bull; $3 = 300 cents.<br>
&bull; $6.25 = 625 cents.<br>
&bull; 750 cents = 750 cents.<br>
&bull; $5 = 500 cents.<br>
&bull; Largest: 750 cents = $7.50.<br><br>
Final Answer: C: 750 cents