问题详情

Researchers find it difficult to make algae produce hydrogen efficiently because __________. 查看材料
A.removing the sulfate slows down hydrogen production
B.it is hard to create an airfree environment
C.it is expensive to remove the sulfate from the environment
D.the algae"s cells work slowly if there is no oxygen in the air请帮忙给出正确答案和分析，谢谢！