Step 1: Think about how a rural buyer actually decides to trust a new product. It is rarely a hoarding or a loud jingle, it is usually a known face, a dealer, or a village demonstration recommending it.
Step 2: Flashy and aggressive styles are built for urban, high-exposure media markets, and simple repetition without a human touch does not address the trust gap in villages.
Step 3: Since rural buying decisions lean on relationships and direct contact rather than mass media intensity, the promotion style that fits best is a personal one. \[\boxed{\text{Personal}}\]