on OR for OR because OR due to

[Majid72]

Hello

May somebody tell me which choice is OK?

He flew home on//for//because of //due to the death of his friend.

Thanks a lot

[Milanya]

"because of', He flew home because of the death of his friend.
but it sounds awkward to me.
He flew home because of his friend's death.
He flew home because his friend had died.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.