Most primates are immune to feline rhinovirus, but a specific group, this being the golden macaques, are highly susceptible to the organism.
(A) a specific group, this being the golden macaques, are highly susceptible to
(B) a specific group, the golden macaques, is highly susceptible to
(C) one group, specifically golden macaques, is highly susceptible of
(D) a specific group, the golden macaques, which are highly susceptible to（B）
(E) a specific group, the golden macaques, which are highly susceptible of
(B) a specific group, the golden macaques, is highly susceptible to
这句话a specific group做单数名词主语,所以后面谓语用is, the golden macaques做其同位语起解释作用, 对吗? | 
