In Recent Times the Cost of Producing Electricity and the Manufacturing

In recent times the cost of producing electricity and the manufacturing of solar panels in the solar energy industry has fallen,but the government subsidies to this industry remain the same (as at 30/6/2012) .This is an example of:

A) growth leading to mature industry.
B) infant industry 'growing up'.
C) government inertia.
D) self-sufficient industry.