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In the early 1980s, the group that was at high risk for contracting HIV/AIDS was:
D. Blood-transfusion recipients.
At that time, before proper screening measures were put in place to detect HIV in blood donations, individuals who received blood transfusions were at a significant risk of contracting the virus. This was a critical issue in the early days of the HIV/AIDS epidemic when the understanding of the virus and its transmission was still evolving.