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The condition described involves six-week-old kittens presenting with intermittent soft stools accompanied by blood, which is indicative of a possible gastrointestinal infection or parasitic issue. The most appropriate therapy in this scenario is sulfadimethoxine, which is a sulfonamide antibiotic commonly used to treat various bacterial infections and can also be effective against certain protozoal infections like coccidiosis, a well-known cause of diarrhea with blood in young animals.

Sulfadimethoxine acts by inhibiting the synthesis of folic acid in bacteria and some protozoa, thereby preventing their growth and replication. Given that blood in the stool can often be associated with infections or parasites, administering sulfadimethoxine can help address the underlying bacterial component, improving the kittens' condition.

In contrast, other options are less relevant for treating the symptoms presented. For instance, dichlorvos is primarily used as a broad-spectrum antiparasitic, particularly against nematodes, but it does not have a strong indication for the symptoms noted. Fenbendazole is typically effective against certain gastrointestinal parasites, but it might not address the potential bacterial component causing blood in the stool effectively. Ivermectin is mainly used for ectoparasites and some internal parasites,