If the theatre decides to expand by adding 4 more rows, how many chairs would be in the 8th row?
A) The same number as in the original 4 rows.
B) 4 times the number of chairs in the 2nd row.
C) 8 times the number of chairs in the 1st row.
D) The number of chairs in the original 4 rows plus the total number of chairs added.