Use the scenario to answer the question.

Peter is keeping track of his checking account balance. On the 1st of the month, he has $300. On the 6th, the checking account shows a balance of $273.65. On the 19th, Peter has $205.14. On the 25th, he is left with $173.52, and on the 28th, he is left with $157.71. What is the rate of change of his expenditures?

A. 3.11
B. -5.27
C. -3.78
D. -4.29