Final answer:
The nurse researcher is using the ethical principle of informed consent when she distributes an explanatory information sheet to subjects solicited for participation in her study.
Step-by-step explanation:
The nurse researcher is using the ethical principle of b when she distributes an explanatory information sheet to subjects solicited for participation in her study. Informed consent means that participants are provided with all the relevant information about the study, including the purpose, procedures, potential risks, and benefits, so that they can make an informed decision about whether to participate.