Iwill give 20pts, ! some fuel cells are powered by hydrogen. scientists are looking into the decomposition of water (h2o) to make hydrogen fuel with the of the sun’s energy. what challenge do scientists face with this task? a. decomposing water requires a high activation energy. b. the sun isn't a renewable resource. c. decomposing water results in toxic byproducts. d. scientists are uncertain what to do with the excess oxygen.