Answer:
Cost of the distribution network
Explanation:
The cost of building a distribution network is the major concern. Each refill station costs about $1.5 million.
A is wrong. Hydrogen comes from water, which is plentiful in the oceans. When hydrogen reacts in the fuel cell, the water is re-formed
C is wrong. The fuel cell will last for about 300 000 km.
D is wrong. Although hydrogen can be produced from petroleum, water is the most likely source.
