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 the solution set.
- $-15 s+130+5(3 s-25) =0$

A) Identity; {all real numbers}
B) Contradiction; $\varnothing$
C) Conditional; $\{1\}$
D) Conditional; $\{3\}$