Fantasy help. please. Sproles? Garcon? Knox? Meachem? help me out here?

i need to clinch playoffs this week and i can with a W and id like to just do that and get it over with now. i have a flex position. i do not know who to start i have strong RB's in MJD and chris johnson if that altars my decision at all but here it is at the flex who do i give the start? Darren Sproles vs. the broncos, Pierre Garcon vs. the ravens, Johnny Knox vs. the eagles, or robert meachem vs. the bucs