I would suggest inspecting the data labels on the back of the monitor, or maybe the manual.
But, just to make sure I'm not misunderstanding: are you talking about a passive power cable (the ones that are used with PSUs), or a cable with a power converter/transformer brick (like with laptop chargers, for example)? Passive cable would carry AC power, while a cable with a converter would transform it from AC to DC, along the way.
It really depends on whether your monitor has a power converter inside of it, or whether it's part of the cable. But I would assume that the cables are most likely standardized, so if the plugs just fit, you should be good to go.
If all the cables are passive (meaning that there are no "bricks" in between), then you can probably use any one of them. For example the 250V 10A should theoretically stand 2500W power draw. Your monitor should be well below 100W (it's probably around 30-40W). Even 250V 5A should be enough. The cables' limits should never come into play. There should be a fuse inside the monitor that protects the monitor from going above its limits.
