Final answer:
Add statistics about the cost of grooming to the introduction to emphasize potential savings and provide a factual basis for arguments about saving money.
Step-by-step explanation:
To strengthen the idea that the audience can save money in the introduction, you should add statistics about the cost of grooming. This approach offers concrete figures that reflect potential savings, thereby directly supporting the central claim about cost-effectiveness. Use of statistics in an introduction creates a factual basis for arguments that will follow, and can be more compelling than anecdotes or questions that may seem tangential to the topic. While jokes, questions, and anecdotes can be engaging, they might not specifically reinforce the message of saving money as effectively as statistics do.