Question

It's possible that someone might have to choose between performing or not performing an action that could lead to serious harm to a friend—yet each choice could involve the same two virtues (for example, the virtues of honesty and loyalty). such a case suggests that virtue ethics may have a problem with:

Answer 1

Criterion 3 known as usefulness

virtue ethics is an approach to Ethics that emphasizes an individual's character as the key element of ethical thinking, rather than rules about the acts themselves  or their consequences.

Answer 2

I Believe the answer is: Criterion 3, which is usefulness.
Criterion 3 focus on usefulness in moral problem solving. While common problem solving only focus on the end result, the decisions that made through moral problem solving must also consider the ethical and humanistic value of the decision.