Sylvi says 15.4375 ÷ 3.25 = 4.75 exactly. Which of these shows that she is correct?

a: 15 / 3= 5
b: 15.4375 ÷ 5 = 3.0875
c: 4.75 x 3.25 = 15.4375
d: 3.25= 3 1/4 and 4.75 = 4 3/4
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