The correct answer is A. They support the production of a wide range of important crops

Explanation:

In the text presented, the author explains in the last years an important percentage of bees have been lost and scientists are trying to understand this through multiple factors such as the Varroa mites, a new bacterium that attacks bees, lack of habitats for bees and use of chemicals in plants. However, the author remarks this issue has not been solved and if it could have important negative effects in human life, about this the author explains the death of bees affect human food chain, because multiple crops including fruits, vegetables, grains, and grasses depend on bees, which means the real treasure of bees is not the honey but their role in crops.

Therefore, the state that best summarizes the importance of taking caring of bees is “They support the production of a wide range of important crops”, because the author emphasizes the importance of bees is not the honey but that humans depend on them to eat as bees keep healthy multiple crops.