Answer:
Option B. 20 pieces
Explanation:
The length of a strip of wood = 78 inches 
This strip of wood is to be cut into pieces = 
 inches 
We have to calculate how many pieces can be cut.
So first we convert mixed fraction to proper fraction and then to decimal.
 
 = 
 = 3.75 inches
Now we divide 78 inches to 3.75 inches.
78 ÷ 3.75 = 20.8 pieces
we got 20 pieces of 
 inches.
Option B. 20