Answer:

Explanation:
Given equation,
a ( b - c ) = d ----(1)
For finding the formula for c by this equation,
We need to isolate c in the left side of the equation,
By applying distributive property in equation (1),
ab - ac = d
Subtracting ab on both sides,
-ac = d - ab
Divide both sides by -a

Which is the equation for c.
THIRD option is correct.