Assuming Delia works 5 days a week:
Since she works from 8:00 to 16:30, she works 8.5 hours a day. However, she takes one hour off for lunch, so in reality she works 7.5 hours a day.
Since we're assuming she works 5 days a week, she works

hours a week. If her hourly wage is $4.80, then she earns

so she earns $180 per week. Option c. is the correct answer.