Use the image to answer the question.
A grid is shown with a rectangle drawn on it. The rectangle is 10 inches long and 2 inches wide, labeled with 10 and respectively.
The scale factor is: 1 box=6 inches.
Maisie needs to convert this scale drawing from a scale of 1 box=6 inches to a scale factor of 1 box=12 inches. The length in the scale drawing shown is 10 boxes. What will be the length of the boxes in the new drawing?
A. 1
B. 5
C. 12
D. 20
Since the scale factor is changing from 1 box=6 inches to 1 box=12 inches, the length of the boxes in the new drawing will be twice as long. Therefore, the length of the boxes in the new drawing will be 2 inches.
Answer: \boxed{B. \text{ 5}}.