If Two Coherent Waves, One with Intensity $8.0 I_{0}$ And the Other with Intensity

Multiple Choice

If two coherent waves, one with intensity $8.0 I_{0}$ and the other with intensity $4.0 I_{0}$ , undergo destructive interference, what is the resulting intensity?

A) $4.0 I_{0}$
B) $0.69 I_{0}$
C) $-4.0 I_{0}$
D) $1.9 I_{0}$
E) $6.0 I_{0}$