Question

The use of coal had decreased as a result of competition form oil and ?

Answer 1

Why did the use of coal decrease?
There are several factors that have contributed to the gradual decline in coal consumption since 2007. One of the major factors is both the availability and price of other electricity generating fuels. These alternative fuels include, natural gas, and cleaner energy generation options like solar and wind.
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Answer 2

The use of coal had decreased as a result of competition from oil and gas.

The answer is Gas. An alternate answer could be Electricity.