What were the injections doing to group a?

Without specific context about the study or experiment involving "group A," it's challenging to provide a precise answer. Generally, injections in a research setting could be used to administer a treatment, vaccine, or placebo to assess its effects on health outcomes, behavior, or biological responses in that group. The results would typically be analyzed to determine the efficacy or safety of the injection compared to other groups. If you have more details, I can provide a more tailored response.