Answer:
Option D
Step-by-step explanation:
• The number of black and white copies = b
,
• The number of colored copies = c
The customer bought 68 copies in total:

• b copies at $0.08 per copy = 0.08b
,
• c copies at $0.15 per copy = 0.15c
The customer spent a total of $6.00.

The required system of equations is Option D.