Cell phones require powerful batteries in order to work effectively. Which
activity is best described as an engineering endeavor related to cell-phone
batteries?
A. Designing an investigation that will help determine where the
materials used to make them can be found
B. Performing experiments to explain how different materials used in
batteries store energy
O C. Developing a plan to convince cell-phone companies to use their
batteries
D. Improving their design to make it easier to recycle them when they
are no longer useful