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.
- $- 20 s + 47 + 5 ( 4 s - 8 ) = 0$

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