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.
- $2 ( 28 t + 20 ) = 8 ( 2 t + 40 )$

A) Contradiction; $\{ - 9 \}$
B) Conditional; $\{ 7 \}$
C) Conditional; $\{ - 9 \}$
D) Identity; $\{ 7 \}$