Identifying Subject-Verb Agreement Errors

In a recent study on environmental conservation, researchers concluded that the majority of participants, regardless of their age, were in favor of implementing stricter regulations on waste management. The findings suggest that, despite varying levels of awareness about environmental issues, the collective enthusiasm for improvement is evident. However, the study also noted that many individuals are not fully aware of how their daily actions affect the environment. With that information in mind, which of the following sentences correctly addresses a grammatical issue related to subject-verb agreement?