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.
- $12 \mathrm{k}+186=4(3 \mathrm{k}+45)$

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