Select the real-world problem that could be solved using a proportion. A Sheila has 2 dogs and adopts 2 more. How many dogs does she have in total?
B Sheila must pay $360 for a phone and then $60 each month for service. How much will she have paid after 10 months?
C Sheila has 6 pens and 10 pencils. How many more pens does she need to make the number of pens and pencils she has equivalent?
D Sheila travels 360 miles in 6 hours. At this rate, how far will she travel in 10 hours?