Min function problems

Hi !! Hope you geniuses can help me.. this is driving me crazy.

I need to find the smallest number in column "d", but only if the corresponding row, column "a" = yes.


for example:

A l B C D
1 yes x o 3
2 no x o 1
3 yes x o 2
4 yes x o 4

so, in this instance i need a formula to bring back the number "2", since its the smallest number that appears on the same line as "yes"..

I've tried other formulas, but they keep bringing back "1".



Thank you sooo much!!!