Which of these is a concern with respect to using fuel cell cars?
o use of non-renewable resources
o cost of the distribution network
battery recharge or replacement
reliance on petroleum products

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.

i believe the answer is a.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8