i would guess "Qué"  because not specific.     I wish this was answered.   If in the example they were in front of flower stand example would be better.

I think more types of flowers in world then tv shows.    over a 1,000 types or dahilas and roses each

Hola Seth y Goo,

I can understand your confusion because we English speakers would often use that question to mean “What [programme] are you watching on television.” However, in the lesson they strongly emphasise that “cuál” has a sense of “which one,” so if they had wanted the “cuál” answer, they would have used a question like “which programme are you watching on television;” but they didn’t. Hence “qué.” The question setters are very consistent in picking up on the key differentiating factors. Saludos. John

Hay hamón con huevos o avena con fresas,¿cuál prefieres?