Stitch, Clawandfang, Mornai and lbt/cty_lover got it right. The correct answer is that C ate the sausages. The only one telling the truth was D.
If you assume A to be the culprit, both C's and D's statements must be correct. Choose B, and the other three boys' statements must be true. If you make D out to be the criminal, then what both B and C are saying must be true.
Only C being the suspect makes it possible for only one, D in this case, to being truthful. Now to decide C's punishment.

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So, the score thus far:
Stitch: 420 points (12 Hint Points)
Flathead770: 0 points (10 Hint Points)
Mornai: 395 points (14 Hint Points)
Clawandfang: 720 points (14 Hint Points)
LBTFan13: 0 points (10 Hint Points)
Tails_155: 80 points (12 Hint Points)
lbt/cty_lover: 610 points (13 Hint Points)
Mumbling: 220 points (14 Hint Points)
action9000: 0 points (10 Hint Points)
mcr mad: 0 points (10 Hint Points)
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We are down to the last week of the puzzles. The rules will change soon, ensuring that even the ones that are behind have a chance at making a HUGE comeback and winning it all. Just because you've got the lead now doesn't mean you'll win it all. There's one last little thing that will make all the difference.
For now, Stitch, it's your turn.
