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What to do when there are 3 voices?

So, I am arranging K 545 for a string quartet which is why I am asking this question. What should I do when I come across an area with 3 voices like for example bars 1-11? It is easy for me to decide what to do for 4 voices or for 2 voices or for a single voice. But the 3 voice situation is more complicated. Here is what I do for different numbers of voices:

4 Voices(such as bar 12):

1 voice per instrument, no octave doublings

2 Voices, both treble(such as bars 18-20):

Have first violin take up the higher voice and have second violin take up lower voice

2 Voices, both bass(which doesn't occur in the sonata):

Have viola take up the higher voice and have cello take up the lower voice

2 Voices, 1 treble and 1 bass(such as in bars 31 and 32):

Have either of the violins take up the higher voice and have either the viola or the cello take up the lower voice depending on how low the bass voice goes

1 Voice(such as in bar 13):

Simplest situation of all, just look at the range and see what instrument is best for that range.

In either the 2 voice cases or the 1 voice case, there may or may not be octave or unison doublings. Partly depends on whether there have been any rests recently.

But the majority of the sonata is in 3 voices. Sometimes, it is 2 bass and 1 treble and other times it is 2 treble and 1 bass. This is way harder to decide on, because the viola can partner up with the cello as a bass instrument or it can partner up with the violins as a treble instrument. And the 3 voices situation brings up the question of whether I should have the other instrument double by the unison or the octave or whether I should just leave it out. 

I was wondering if someone could give me some advice here on what to do when I see 3 voices in the sonata that I am arranging for string quartet.

Hey, so I wrote a cello sonata.

Heyo, so I've been experimenting with composition for a little while, but this is my first big semi-sophisticated project. I'm turning in the score for my AP Music Theory course, and I'll have to find a pianist and play this in front of the class (I'm a cellist). I'm not super keen on embarrassing myself and all, so any feedback on piano notation, style, general thoughts, etc. would be super duper appreciated!

https://musescore.com/user/6559981/scores/5544087