4. The sum of three different positive integers is 7 . What is the product of these three integers?
A 12
B 10
C 9
D 8
E 5
4. D The sum of the three smallest positive integers is $1+2+3=6$. Hence the only way to add three different positive integers to obtain a total of 7 is $1+2+4$. Therefore the product of the three integers is $1 \times 2 \times 4=8$.