What approximate value should come in the place of question mark (?) in the following question? (8423 + 3120 + 6543) (1536 + 377 + 189) = ?

What approximate value should come in the place of question mark (?) i

1.	What approximate value should come in the place of question mark (?) in the following question? (8423 + 3120 + 6543) (1536 + 377 + 189) = ?
A.	5
B.	14
C.	9
D.	18
E.	3
Answer» D. 18