Which of the Following Measures Is in Breach of Article

Which of the following measures is in breach of Article 34 TFEU?

A) An advertising campaign promoting German agriculture and the German food industry organized by a private company whose organs were set up in accordance with German private law rules and financed by compulsory contributions paid by undertakings in the German agriculture and food sector.
B) An advertising campaign promoting German agriculture and the German food industry organized by a private company whose organs were set up in accordance with German private law rules and financed by voluntary contributions paid by undertakings in the German agriculture and food sector.
C) An advertising campaign promoting German agriculture and the German food industry organized by German farmers.