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