Jonathan pays $1.90 per pound for potatoes. He buys 8.3 pounds of potatoes. He determines that he will pay $15.77, before tax, for the potatoes. Which best describes the reasonableness of Jonathan’s solution?

To determine the reasonableness of Jonathan's solution, we can first verify the actual calculation:

Jonathan buys 8.3 pounds of potatoes at $1.90 per pound. We calculate the total cost:

\[
\text{Total Cost} = \text{Price per pound} \times \text{Number of pounds} = 1.90 \times 8.3
\]

Calculating that:

\[
1.90 \times 8.3 = 15.77
\]

So, Jonathan's calculation is indeed correct.

Now let's evaluate the provided statements about the reasonableness:

1. **"Jonathan’s answer is reasonable because there are two decimal places in the factors and two in the product."**
- This statement addresses the decimal places but doesn't necessarily reflect the correctness of the calculation. While it's true that the factors and product have a proper arrangement of decimal places, it doesn't confirm the accuracy.

2. **"Jonathan’s answer is unreasonable because there are three decimal places in the factors and two in the product."**
- This statement is inaccurate because there are not three decimal places in the factors (1.90 has two, and 8.3 has one).

3. **"Jonathan’s answer is reasonable because 2 times 8 is 16, and 16 is close to 15.77."**
- This statement is valid as an estimation. Since \( 1.90 \) is close to \( 2 \) and \( 8.3 \) is close to \( 8 \), multiplying these gives \( 16 \), which is indeed close to \( 15.77 \).

4. **"Jonathan’s answer is unreasonable because 1 times 8 is 8, and 8 is not very close to 15.77."**
- This statement incorrectly uses a simplified version of the multiplication that does not reflect the actual values being rounded.

Based on the evaluation, the most accurate and reasonable description of Jonathan's solution is:

**"Jonathan’s answer is reasonable because 2 times 8 is 16, and 16 is close to 15.77."**