The stage of moral development Kohlberg would most likely say that Lu is demonstrating is:
D. Conventional stage.
According to Lawrence Kohlberg's theory, there are three possible moral development stages:
1. Pre-conventional
2. Conventional
3. Post-conventional
The one that matters most to us here is the conventional stage of moral development. This is when we internalize the values and rules modeled and taught to us by adults.
At the conventional stage, we do not question authority. We accept what we are told we should or should not do.
This is the stage where Lu is at (notice that the name Lena also appears in the question). She has accepted the fact that vaping is illegal, for that reason, is not going to do it.
Learn more about Kohlberg's stages of moral development here:
brainly.com/question/8885213