In which biotechnology process are scientists mainly concerned with the ethical implications regarding participants' rights?

The focus on ethical implications regarding participants' rights is particularly significant in psychological research. This process often involves human subjects, and key ethical considerations include informed consent, confidentiality, and the potential for psychological harm. Researchers must ensure that participants are fully aware of the nature of the study, its objectives, and any risks involved, allowing them to make informed choices about their participation.

In contrast, while the other options also may raise ethical concerns, they typically do not emphasize participants' rights to the same extent. Gene therapy and genetic modification involve manipulating genetic materials and can raise bioethical questions related to consent, especially when it comes to altering genetic traits. However, these generally pertain more to long-term consequences and societal implications rather than immediate participants' rights. Environmental impact studies assess the effects of projects on ecosystems but focus more on ecological rather than human participant ethics. Thus, psychological research stands out as the area where the protection of individual rights is paramount.