In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: Problem: the unit digit in the product ( 784 x 618 x 917 x 463 ) is :
Options: a ) 5 , b ) 9 , c ) 16 , d ) 2 , e ) 42
[A]: d

[Q]: Problem: if the radius of a cylinder is doubled and height 5 times , what is the new volume of the cylinder divided by the old one ?
Options: a ) 8 . , b ) 2 . , c ) 6 . , d ) 20 . , e ) 10 .
[A]: d

[Q]: Problem: what is the sum of all 3 digit numbers that leave a remainder of ' 2 ' when divided by 8 ?
Options: a ) 61,600 , b ) 64,850 , c ) 64,749 , d ) 49,700 , e ) 56,720
[A]:
a