Experiment Two Conclusion:

Mutant Strain B Does Not Emit Light

Even when cultured to a high population density, the mutant strain B does not produce bioluminescence either.

Without signaling molecules, quorum sensing does not take place.

The results of these two experiments are consistent with the mutant strains being defective in quorum sensing.

A culture dish showing bioluminescence in a normal strain.
Bioluminescence in normal strain
A divided dish with both sides labeled B. None of the cells on either side display bioluminescence.
No bioluminescence in mutant strain B