Option b) 2 x 2 x 3 x 3 is correct.
We have, 5/9 + 7/12
factors can be define splitting the value in multipliable values.
Taking lowest common multiple of denominators 9, 12.
i.e. 2 x 2 x 3 x 3
lowest common denominator =36
The factors of 36 = 2 x 2 x 3 x 3
Thus The required factor for lowest common denominator 36 is 2 x 2 x 3 x 3
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