The promotion of companies' sustainably harvested rainforest products is intended to give the company a competitive advantage. Thus, the correct option is C.
The products of rainforests generally include some food yields like cassava, cocoa, nuts, yams, and other commercial products like silk, rubber, cotton, etc.
Rainforests are required to harvest sustainably by the effort of individuals, municipal corporations, and even government authorities.
The promotion of such companies once take the initiative to harvest the rainforests sustainably, they are intended to give a competitive advantage.
Therefore, the correct option for this question is C.
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