A
their findings, which showed that the new drug was effective in treating the disease, and they plan to publish them next month.
B
its findings, which showed that the new drug was effective in treating the disease, and the team plans to publish them next month.
C
their findings, which showed the new drug was effective in treating the disease, and the team plans to publish its findings next month.
D
its findings, which showed the new drug was effective in treating the disease, and the team plans to publish the findings next month.
✓ Correct Answer: Option D
'Research team' is a singular collective noun, requiring the singular possessive pronoun 'its.' Additionally, 'them' in the original is ambiguous; 'the findings' clarifies what will be published.