Me and the bbc agree on sceptical

http://www.bbc.co.uk/news/world-middle-east-24057083


>I guess I mostly read American literature, since for me "sceptical" looks "wrong". (And Opera adds a read line under the word...)
>
>>In the United States, I'd be skeptical of spelling it "sceptical".
>>
>>
>>
>>>Hi everybody,
>>>
>>>Just want to learn which is more accepted form for this word. I wrote it with a k first and decided to verify my spelling and found
>>>
>>>http://dictionary.reference.com/browse/sceptical
>>>
>>>which suggests both spellings. So, which one is most acceptable?
>>>
>>>Thanks in advance.