Based on Paragraph 1, it is correct to say that...

petroleum and oil products are the most significant energy sources in Brazil, followed by sugar-cane ethanol and hydroelectric power.

petroleum and oil products must be the top priority of the Brazilian government.

ethanol derived from sugar-cane has surpassed all other forms of power generation in Brazil.

hydroelectric plants have always been the most efficient source of energy in Brazil.

hydroelectric plants and cane-based ethanol are, nowadays, the most productive sources of energy in Brazil.