As Lavonda's parents, the best response to guide her towards achieving her goal of becoming a dentist by the age of 19 would be:
"That's a great goal though it might take a little longer than you're thinking. Let's do some research together about the next steps and how long they may take."
1. This response acknowledges Lavonda's ambition and positivity towards setting a career goal at a young age.
2. By expressing support for her goal and suggesting to do research together, it encourages proactive steps to understand the path to becoming a dentist.
3. Researching the educational requirements, timeline, and steps involved in becoming a dentist can help Lavonda gain a realistic understanding of what it takes to achieve her goal.
4. Providing guidance and support in exploring the necessary steps can strengthen Lavonda's commitment and determination towards her career aspiration.
By fostering a positive and informative conversation around Lavonda's goal, her parents can help her develop a clearer roadmap towards becoming a dentist and enhance her chances of success.