Decide Whether the Equation Is "Conditional," an "Identity," or a "Contradiction

Multiple Choice

Decide whether the equation is "conditional," an "identity," or a "contradiction." Give its solution set.
- $5 ( 5 g - 28 ) - 25 g + 140 = 0$

A) Conditional; {all real numbers $$ }
B) Identity; {all real numbers $\}$
C) Identity; $\varnothing$
D) Contradiction; $\varnothing$