Dan used the following method to convert 27.7778 cm/s to km/h. An equation is shown. The expression on the left has three terms separated by the multiplication sign. The first term is 27.7778 cm by 1 h. The second term is 1 km by 100,000 cm. The third term is 1 s by 0.000277778 h. The number on the right of the equal to sign is 1 km per hour. (1 km = 100,000 cm and 1 s = 0.000277778 h) What is the error in Dan's conversion method?

A. 1 h should be written as 1 s.

B. 1 km should be written as 1 cm.

C. 27.7778 cm should be written as 27.7778 km.

D. 0.000277778 h should be written as 0.000277778 s.