Observe as frases: “The researchers put people into five diffe...

Observe as frases: “The researchers put people into five different groups, depending on how much fruit
and vegetables they ate. "They found that those who ate seven or more portions a day
had a 42 percent lower risk of death than those who ate just one portion.”, o pronome
"they" refere-se a:

a) diferentes grupos.
b) vegetais.
c) frutas.
d) pesquisadores.​