Oral presentation of a message in the form of conversation with one or more prospective customers for the purpose of making sales is known as:

Option 1 -> On-line Selling involves selling products through digital platforms and websites, not through oral conversation.

Option 2 -> Sales promotion refers to short-term incentives like discounts, coupons, or offers to stimulate quick purchases, not direct oral interaction.

Option 3 -> Personal Selling is the direct, face-to-face oral presentation and conversation between a salesperson and prospective customers to make sales.

Option 4 -> Tele Marketing involves selling through telephone calls, which is oral but limited to phone-based communication only.

Hence, Option 3: Personal Selling -> Personal selling involves direct oral communication and conversation between the seller and one or more prospective customers, allowing for interactive dialogue, relationship building, and customized presentations to achieve sales objectives -> correct