The only difference is a comma. You can't have just one comma between a subject (arms) and a verb (held), which is what you have in b), so only a) is OK to use. CJ
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AskAndAnswerWould it be the same with this? There in his domain ...No. 'he' is the subject. 'met' is the verb. Neither of your sentences has a comma between the subject and verb. You don't really need any commas in that sentence.