The correct answer is C) increases.
<em>A catalytic combuster always increases the efficiency of a fireplace.
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A catalytic combustor uses a ceramic honeycomb design of oval shape. It is coated with some noble metal to resist the heat. The smoke can be burned with this application. A catalytic combustor can increase the efficiency by 10% and the air pollution is reduced up to 75%, That is why a catalytic combuster always increases the efficiency of a fireplace.
The other options of the question were a) decreases and b) has no effect.
The ICC could make railroads submit their records to Congress it is the power of the Interstate Commerce Commission over the railroad operations.
Congress in 1887 passed the Interstate Commerce Act, it passed the law in response to public demand that railroad operations be regulated.