Answer:
B.By attacking the credibility of Jack's sources.
Step-by-step explanation:
Cognitive dissonance is a psychological term that refers to a situation which involves conflicting attitudes, beliefs or behaviors.
This then gives rise to a feeling of mental discomfort leading to a change in one of the attitudes, beliefs or behaviors to alleviate the discomfort and restore balance.
Lawanda responded to her own cognitive dissonance in this instance by attacking the credibility of Jack's sources.