He is really angry, so we should leave him alone for a while.

[Kati Svaby]

English Grammar Tests, Elementary Level

ESL/EFL Test #235 "Various Conjunctions (3)", question 8

He is really angry, ......... we should leave him alone for a while.

(a) so
(b) if
(c) until
(d) because

English Grammar Tests, Elementary Level

ESL/EFL Test #235 "Various Conjunctions (3)", answer 8

He is really angry, so we should leave him alone for a while.

Correct answer: (a) so

Your answer was: incorrect
He is really angry, because we should leave him alone for a while.
_________________________

I though which to choose because the sentence seems to me correct with SO, and BECAUSE also.
Can you please to explain why it isn't correct with 'because?'
_________________
Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend.

[Beeesneees]

'Because' is incorrect as 'we should leave him alone for a while' is not the reason for his anger. It is wjat they should do as the result of his anger.
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"Inside every old person is a young person wondering what happened."
Terry Pratchett