Martha went shopping and wants to buy the following items.

A dress for $85.00
A pair of shoes for $62.00
A shirt for $23.00

She has one coupon to use on her purchase.
20% off the total, before tax
If she uses the coupon, what will be her total before tax?

A. $170.00
B. $34.00
C. $150.00
D. $136.00