Lithium ion batteries are now commonly used in rechargeable consumer electronic devices. The main reason lithium is used in these devices is because :
A. lithium has a lower electronegativity than nickel in common nickel-cadmium batteries
B. lithium batteries are not as toxic as common alkaline batteries
C. lithium batteries have a reduced risk of leakage of chemicals
D. lithium batteries achieve a greater amount of energy stored per unit mass than other common batteries
