Your options ( a) through and including ( d) are fine. ( e) is odd. What manual are you referencing?
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AnonymousCook's (1985, p. 168) Line by Line says that most experts consider the usage of 'as' as 'because' ambiguous;It can be ambiguous in some sentences. It's not in yours.
Anonymousit says that 'As a coordinating conjunction, "for" sounds rather stilted and old-fashioned these days'That is my personal opinion als
There would be ambiguity in:As he's arriving tomorrow, we'll go home.Thank you for the helpful answer.
AnonymousAPA's (2009, p. 84) manual recommends using 'because' instead of 'since'.That's good advice because many publications reference APA as their style guide. When in doubt, go with the flow.
Anonymous "for" sounds rather stilted and old-fashioned these days'Yes, it's the conventional style of the King James Bible.