Answer
$d. x(x-5)$
Work Step by Step
The lowest common denominator for this problem can be found by comparing the three denominators.
1. $1$
2. $(x-5)$
3. $x(x-5)$
If we multiply the first denominator by $x(x-5)$ and the second denominators by $x$ we will arrive at a LCD of $x(x-5)$.