Answer:
B. 10 quarter hours.
Explanation:
To find the number of quarter hours in 2 and 1/2 hours, we need to convert 2 and 1/2 hours to quarter hours.
1 hour is equal to 4 quarter hours because there are 4 quarters in an hour.
To convert 2 and 1/2 hours to quarter hours, we multiply the number of hours by 4 and add the number of quarter hours.
2 hours x 4 = 8 quarter hours
1/2 hour x 4 = 2 quarter hours
Adding these together, we get:
8 quarter hours + 2 quarter hours = 10 quarter hours
Therefore, the answer is B. 10 quarter hours.