I would pinch those off at the soil.
Thoroughly moisten the soil and replant.
Cover with a tray top or clear plastic to keep the humidity up.
If you keep it covered, you probably wont need to water again until they sprout and you take the cover off.
Don't use the light until 3/4 of the tray has sprouted. Remove the plastic then too.
For extra help -
If you don't have a window to use for extra light, reflect light on the sides with tin foil walls made by covering
cardboard with foil. A couple of mirrors would work too.
If you have a fan, you can use it on a low setting to blow at the plants and increase stalk strength.