output a list based on conditional formatting

[Bladecalls]

hi all

i am trying to output a list from column A depending on the contents of cells in another column

column a Contains Names and the other columns all contain numbers

i wish for one list, from column A, to be produced based on if the number in column C is less than 20
and then the same for column D and E

so it would read

Column C

1
2
3
4
5
6

Column D
2
4
6
8
10

Column E
1
3
6
9

any help would be gratefully received

TIA