The table below lists some potential advantages and disadvantages of using hydrogen-oxygen fuel cells instead of rechargeable batteries to power electric vehicles.
| Advantage | Disadvantage | |
|---|---|---|
| A | Hydrogen gas is easy to liquefy and store at room temperature. | The only by-product of their operation is carbon dioxide, CO2\text{CO}_2CO2. |
| B | They can be refueled quickly and do not require hours of electric recharging. | The hydrogen fuel is often produced from fossil fuels, which releases greenhouse gases. |
| C | They operate silently and have no moving parts. | They produce high levels of harmful nitrogen oxide (NOx\text{NO}_xNOx) emissions during operation. |
| D | Water is the only chemical by-product produced during vehicle operation. | They quickly run out of charge and must be plugged into the mains for hours to recharge. |
Which row in the table is correct?
Row A
Row B
Row C
Row D