If you have 10 pieces of lumber, each measuring 1"x12"x10' long, how many board feet do you have in total?

A) 12
B) 100
C) 120
D) 1200

To calculate the total board feet, you need to multiply the thickness (1 inch), the width (12 inches), and the length (10 feet) of each piece of lumber, and then multiply that result by the number of pieces (10).

Therefore, the calculation is:

1 inch * 12 inches * 10 feet * 10 pieces = 1200 board feet

So, the answer is D) 1200.