1. The problem asks for the best estimate of the amount of money in the jar at the end of the first month, given the line of best fit equation $$B = 0.45m + 1.93$$ where $m$ is the month and $B$ is the balance. 2. The formula used is a linear equation representing the relationship between month $m$ and balance $B$. 3. To find the balance at the end of the first month, substitute $m=1$ into the equation: $$B = 0.45(1) + 1.93$$ 4. Calculate the value: $$B = 0.45 + 1.93 = 2.38$$ 5. Therefore, the best estimate of the amount of money in the jar at the end of the first month is $2.38$. 6. The correct answer is D. $2.38.