Which sentence from “Ellis Island” is a major supporting detail?

a.
“Most arriving immigrants were there for only a short three to five hours.” (paragraph 1)

b.
“The diseases that examining doctors looked for were cholera, scalp and nail fungus, tuberculosis, insanity, epilepsy, mental impairments, and trachoma, a highly contagious eye infection that could lead to blindness and death.” (paragraph 2)

c.
“The doctors at Ellis Island were skilled at conducting 'six-second physicals' during which they could diagnose various conditions with just a glance.” (paragraph 1)

d.
“The minority who were detained on Ellis Island can be divided into three categories.” (paragraph 2)