Because I didn't leave home earlier, I have missed the first part of the play.

[Sb70012]

.......home earlier, we wouldn’t have missed the first part of the play.
a)We had left
b)If we left
c)Had we left (Answer Key)
d)Had we not been

Source: school exam

Hello,
I say to myself that B is also correct. This is my analysis:

If we left home earlier = we didn't leave home earlier
we wouldn't have missed the first part of the play = we have missed the first part of the play

So => Because we didn't leave home earlier, we have missed the first part of the play.

Why can't B work?

Thank you.
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[Beeesneees]

Incorrect tense.
B would have to be

If we had left home earlier... in order to be correct.
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"Inside every old person is a young person wondering what happened."
Terry Pratchett

[Canadian45]

[Beeesneees]

If we'd/ we had left home earlier...
is the only option with the second phrase, set in a time past.

'If we left home earlier...' works with future phrases such as '... we could have a meal before the play starts.
_________________
"Inside every old person is a young person wondering what happened."
Terry Pratchett