You are correct in identifying that options B and D support the statement that human actions are harming bees.
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B) The statement regarding habitat loss acknowledges that it is a significant issue for bees, highlighting the impact of human activities on bee populations.
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D) The conservation biologist's claim that planting bee-friendly flowers might actually increase disease levels directly indicates that human actions, such as planting these flowers, may be contributing to harm.
Although option A, which mentions that beekeepers and farmers need to reconsider their management practices, can also imply harm, it doesn't point as directly to the negative impact of human actions as options B and D do. Therefore, your selection of B and D as the correct answers is accurate.