Which conjunction can make it a meaningful sentence?

I have a lot of homework to do now so i cant go to the cinema with you.

I have a lot of homework to do now _so_I can't go to the cinema with you.

D. So, because if it is added, the sentence given after will become a reason.

' And ' would be used if we are doing two things at the same time.

E.g = I ordered pasta and a glass of red wine.

' But ' would be used if we have an issue but we still made an exception.

E.g = I have a red car but I went by my cycle.

' Or ' is used when given a choice.

E.g = Do you want pepper or chili flakes on your pasta?