Disadvantage; advantage are the correct fillers in the option.
Alternative or sustainable energy is anything that can be used to power light, heat, machines, etc., like oil, coal, or the sun. We are committed to the development of clean, renewable energy sources.
Renewable, alternative, and fossil fuels are the three main categories of energy sources. Sometimes, but not usually, renewable energy is referred to as an alternative. Fossil fuels were produced millions of years ago as dead plants and animals were subjected to extreme heat and pressure in the earth's crust.
Thus, the correct fillers are written above.
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