Who to start at the Flex?WHIR

Guys, everyone has been super helpful so i figure i would see what the thought of the herd would be on who to pick at the FLEX position.

12 Team Standard league

options are:
Amari Cooper
Latavius Murrey
Rex Burkhead
Ameer Abdullah
Damien Williams

Team consists of:
QB: Dak Prescott
WR: DeVante Parker
WR: Stefon Diggs
RB: DeMarco Murray
RB: Mark Ingram
TE: Jimmy Graham
K: Will Lutz
DEF: Jacksonville

Charles Clay
CJ Fiedorowicz
Dede Westbrook
Plus the 5 up top.

please help guys.