B sounds stronger, but the intents are the same. , that in B, it is his boss who forces him to work overtime). While this is true of 'force', that is, that we must use 'force oneself ' if it comes from within, usage shows that many competent writers ignore the limitation set on 'oblige', so that 'I was obliged by my boss', though frowned on by some grammarians, is definitely in use.
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