The answer to the question depends on the context and the market in which the knives are being sold.
- If the knives in question are primarily used for industrial purposes, then the manufacturer's claim about industrial fiber being the most popular material could be accurate.
- Conversely, if the focus is on high-end, decorative, or traditional knives, then your partner's assertion that rosewood is preferred might be correct.
Given that both industrial fiber and rosewood can be popular in different segments of the knife market, the most nuanced answer is:
A) Both the manufacturer and your partner are correct.
This suggests that both materials have their specific applications and popularity depending on the context.