Answer:
The writer owns a company that produces only gas-powered car engines.
Explanation:
To suggest that the writer is biased would mean that the writer's argument against the invention of the scientists is not based on facts or cannot be proven, but rather unfair judgment based on preconceived notions.
Hence, in this case, the most likely suggest that the writer is biased is that "The writer owns a company that produces only gas-powered car engines." This is because the invention of a car engine that runs on water instead of gasoline might lead to a potential loss of sales for the writer's product.