In a replacement study, the defender is found to have an ESL of 4years and the AWD is $-52,000. Based on this information and the challenger estimated AW values in the table below, what is the prudent decision to make?

Years kept/Used	Challenger AW ($per year)
1	-52,000
2	-50,000
3	-48,000
4	-49,500

A) Replace the defender in year 3

B) B) Replace the defender in year 2

C) Retain the defender

D) Replace the defender now