Final answer:
Option B). Adding a quote from a leader in the automobile industry explaining the efficiency of citrus-based ethanol would support the main focus of the passage.
Step-by-step explanation:
The material that, if included in the option, would bolster the passage's primary point is B) a quotation from a prominent figure in the auto industry outlining the effectiveness of ethanol derived from citrus. By supplying expert testimony from a reliable industry source, this data would strengthen the case for the use of ethanol derived from citrus as a practical biofuel alternative. It would further help the primary goal of the passage by demonstrating that influential figures in the automotive sector acknowledge and support the effectiveness of ethanol derived from citrus.