Use the following introductory paragraph to answer the question.

Did you know that some monkeys in Thailand teach their young to floss? If monkeys can do it, then so can we! It is so important to teach our children healthy habits when it comes to oral hygiene. There are many simple strategies you can use when teaching young kids to brush, floss, and make healthy choices about eating and drinking.

1. Detached and objective
2. Accusatory and harsh
3. Formal and academic
4. Optimistic and encouraging

4. Optimistic and encouraging

The introductory paragraph, "Did you know that some monkeys in Thailand teach their young to floss? If monkeys can do it, then so can we! It is so important to teach our children healthy habits when it comes to oral hygiene. There are many simple strategies you can use when teaching young kids to brush, floss, and make healthy choices about eating and drinking," is written in a 4. Optimistic and encouraging tone.

Based on the given introductory paragraph, the answer to the question is 4. Optimistic and encouraging. The paragraph uses phrases like "If monkeys can do it, then so can we!" and "It is so important to teach our children healthy habits" to convey an optimistic and encouraging tone. It emphasizes the idea that we can learn from monkeys and teaches children healthy habits in a positive manner.