Hi,
I fail to see how answer choice (B) describes any psychological harm at all. The principle clearly states that it is OK to tell a lie when telling the truth carries the expectation of producing considerable physical or psychological harm to others:
Truth may cause considerable physical or psychological harm to others
Lying is OK
In answer choice (B), the father lied about which candidate he prefers in order to avoid discussion, not to prevent any considerable physical or psychological harm to his daughter. It is unclear how expressing his preference for Chang could have harmed his daughter, to justify the lie.
In answer choice (C), the husband's lying about his health does not prevent physical or psychological harm to others. On the contrary: it may well cause such harm. Thus, answer choice (C) is incorrect.
Answer choice (D) is the only answer choice where the lie was justified, since a mother's expressing greater love for one child over another can clearly cause considerable psychological harm to the child she does not love as much.
In answer choice (E), Jamal lied to save himself the embarrassment, not to prevent harm to others. This does not reflect the application of the principle as stated in the stimulus.
Does this make sense? Let me know.