How many hours are there in a week?

A week consists of 7 days. Each day has 24 hours. To find the total number of hours in a week, you multiply the number of days by the number of hours in each day:

7 days/week × 24 hours/day = 168 hours/week.

This calculation confirms that there are 168 hours in a week. The other choices do not align with the standard calculation of hours in a week, as they do not multiply the correct number of days by the number of hours in a day. This makes the choice of 168 the accurate and justifiable answer to the question.