Answer:
A . the more often people lie, the more comfortable they became and the more likely they are to tell serious lies.
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Mary Jackson prepared an assignment but John Becker was not ready to approve the result of the assignment which led to the disagreement between them.
It became evident later that John Becker had the wrong input data which made him the wrong party in the disagreement.
Grendel doesn't want to kill him because he prefers to torment him. Unferth declares himself a hero