Final answer:
Option (c) 'She was afraid that she was pregnant with Offett's child' is not a reason Mrs. Underwood lied since there is no mention or implication of such a fear in the information provided.
Step-by-step explanation:
To answer which of the following is NOT a reason Mrs. Underwood lied, we need to consider the details provided. From the information given, we do not have any evidence that Mrs. Underwood was afraid that she was pregnant with Offett's child. The options given cite reasons for potential deception such as fear of public scorn, fear of her husband finding out about a potential affair and divorcing her, as well as a neighbor possibly seeing Offett at her house. However, there is no mention or implication of Mrs. Underwood lying due to a fear of pregnancy. Therefore, it's reasonable to conclude that option (c) 'She was afraid that she was pregnant with Offett's child' is NOT a reason for Mrs. Underwood's lie given the information we have.