The concept of using waste energy to generate steam has been gaining in popularity. This is mainly because of ______ fuel costs.

The concept of using waste energy to generate steam has been gaining in popularity. This is mainly because of ______ fuel costs.

The concept of using waste energy to generate steam has been gaining in popularity. This is mainly because of ______ fuel costs.



A ) lower
B ) moderate
C ) higher
D ) more


Answer: C


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