In this sentence:

> ドアの音に驚いた **のか** 、軽く上体がかしいだ

a door opens, and there is a character, whose upper body is slightly bent
forward, startled by the door's sound.

I think `の` just nominalize `ドアの音に驚いた`, but I'm not sure about `か`: I don't
think is the embedded question-か, given how it goes on (`軽く上体がかしいだ`), and I
can't think an use of `か` I know of that suits this sentence.

Since as far as I know `か` can also be used to express doubt I was wondering
if it's something like " **Maybe due** to being startled by the door's sound,
[she had her] upper body slightly bent forward", but I'm not sure.
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2019-09-21T12:38:45.790
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2019-09-21T16:16:56.177
2019-09-21T16:16:56.177
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question
grammar particle-の particle-か
What does のか mean in this sentence?