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.
- $12 \mathrm { k } + 70 = 4 ( 3 \mathrm { k } + 17 )$

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