Which of the Following Best Expresses Strawser's Principle of Unnecessary

Which of the following best expresses Strawser's Principle of Unnecessary Risk?

A) Military commanders are always obligated to choose a method of carrying out combat operations that exposes their subordinates to as little risk as possible.
B) Military commanders should never order their subordinates to take unnecessary risks, even if doing so increases the likelihood of civilian casualties.
C) Military commanders should never order their subordinates to take unnecessary risks, where a risk counts as necessary only if it is required to protect civilian lives.
D) If a commander orders a subordinate to accomplish some legitimate military goal, then the commander ought to choose the means of accomplishing the goal that exposes the subordinate to as little risk as possible.