Well, that's as good a reason as any not to park.
as and because have same meaning in this sentence
Yes, mar could be translated as either “as”, “because”, or “since” in this sentence. If “as” wasn’t accepted, did you report it as an error?
Yes, I did! Go raibh maith agat, scilling.
my audio isn't working on this sentence any time it comes up in this section, though the others do.
Did you get this sentence as a "Type what you hear" exercise?
I think so. It's never happened before. I logged in and out of Duo several times but it always happened on the same questions so I gave up and went to other modules, which worked fine.
You should follow the links in this post and submit a separate bug report - the Duolingo engineers don't monitor posts in the Irish discussions.