Will mark brainliest!plz help EXTRA POINTS!

Answer both questions...

Scientists discovered the ozone layer was depleting at a rapid rate. At the beginning of the study the ozone layer was 3 millimeters thick. Throughout the study it depleted at a rate of 0.04 Millimeters per week.
Which function can be used to find the thickness of the ozone layer in meteres x days sconce the study ?

A) T(x)=-0.04(x+3)

B) T(x)=0.04(x+3)

C) T(x)=0.04x+3

D) T(x)=-0.04x+3