• Ought to suggests obligation or moral duty, which might be a bit strong for simply asking about eating chocolates.
• Can indicates ability or permission, making it the most appropriate choice for asking if it's alright to have some chocolates.

• Might leans towards possibility, which doesn't directly address permission.
• Would can imply a hypothetical situation or a request, but it's less clear than "can" in this context of simply asking permission.

Therefore, "can" is the most natural and direct way to ask if it's okay to eat some chocolates.