Micah left for school with 4 boxes of pencils. Each box had 8 pencils.

At school, he gave away 4 pencils from one box.

Which number sentence below can be used to find the total number of pencils that Micah kept ?

A. 4×8-4=x

B. 3×8+4=x

C. 4×8+4=x

D. 3×8-4=x​