The clearest and most concise choice that conveys all of the information in the original sentence is:
D) A temptation, while one's life is at stake, may be a legal excuse for a crime.
However, this option doesn't completely include the part about moral justification. The correct answer from the provided choices seems to be missing.
Given the choices you have listed, the best option available while still including necessary information would be:
C) And while it may be a legal excuse for a crime, a temptation where one's life is at stake, it is not a moral justification certainly.
Note: The sentence structure of C could be improved for clarity by removing "certainly." But it still conveys both parts of the original statement. If "D" is rephrased or modified to include the moral justification, it would be ideal.