Which correctly renames 7 8 and 5 6 using a common denominator? A. 42 48

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Which correctly renames
7
8
and
5
6
using a common denominator?

A.
42
48
and
40
48
B.
42
48
and
30
48
C.
14
16
and
15
18
D.
28
24
and
20
24