Final answer:
The spells listed from the Harry Potter series do not keep a charm stable. Alohomora unlocks doors, Expelliarmus disarms opponents, Wingardium Leviosa levitates objects, and Stupefy stuns targets. There isn't a stabilization spell mentioned among the choices.
Step-by-step explanation:
The spells in question are from the fictional subject of magic within the Harry Potter series. None of the spells listed specifically keeps a charm stable. However, here is what each spell is known for:
- Alohomora: This spell is used to unlock doors and windows that are not protected by magic.
- Expelliarmus: This is a disarming spell used to knock an object out of another person's hand.
- Wingardium Leviosa: This is a levitation charm used to make objects fly or levitate.
- Stupefy: This spell is used to stun a target, rendering them unconscious.
In the context of these options, the question about a spell that keeps a charm stable does not apply to any of the spells listed as none of them are used for stabilization purposes in the context of magic as described in the Harry Potter series.